A short, four emoji visualization which can be used to identify the right bridge address at a glance.

Bridge-mojis are human-readable bridge identifiers and do not represent the quality of connection to the Tor network or the state of the bridge.

The string of emoji characters cannot be used as input. Users are required to provide the complete bridge address to be able to connect with a bridge.

বর্তমানে চলমান অনেক টর রিলে সম্পর্কে একসাথে জানার জন্য ব্যবহৃত একটি ওয়েব অ্যাপ্লিকেশন হচ্ছে কম্পাস।

A feature in Tor Browser that when required will offer to automatically apply the bridge configuration which works best in the user's location.

Translation notes:

See how it appears on your language's Tor Browser. Keep in English if there is no version of Tor Browser in your language at https://www.torproject.org/download/languages/

The Connection Test in Tor Browser can test and inform the user about the state of their Internet connection and connection to the Tor network.

Dangerzone converts any document (even pdf) to pdf, when the document is potentially dangerous or from an untrustworthy source. This is done by converting the pdf to raw pixel data and then back to pdf.

A special-purpose relay that maintains a list of currently-running relays and periodically publishes a consensus together with the other directory authorities.

Domain fronting is a censorship circumvention technique which masks the site you are connecting to. From the perspective of a censor, it appears like you are connecting to a major service which would be costly for a censor to block, like Microsoft or Google. However, it does not make you anonymous, or completely hide your destination like Tor Browser does. Fore more information see this blogpost about domain fronting.

Spelling notes:

No need to capitalize.

Translation notes:

You can translate this term if it sounds better on your language.

The process of taking a piece of data and scrambling it into a secret code that can only be read by the intended recipient. Tor uses three layers of encryption in the Tor circuit; each relay decrypts one layer before passing the request on to the next relay.

Transmitted data which is encrypted directly from origin to destination is called end-to-end encryption. This helps ensure the data or message being sent is only read by the sending and receiving party.

The last relay in the Tor circuit which sends traffic out onto the public Internet. The service you are connecting to (website, chat service, email provider, etc.) will see the IP address of the exit.

The ExoneraTor service maintains a database of relay IP addresses that have been part of the Tor network. It answers the question of whether there was a Tor relay running on a given IP address on a given date. This service is often useful when dealing with law enforcement.

F-Droid is a repository of FOSS (free and open source software) applications for Android. Just like in Google Play one can browse, install and keep track of updates on the device using F-Droid. Tor Browser is available on F-Droid. Follow these steps if you prefer installing the app through F-Droid.

Mozilla Firefox is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. Tor Browser is built from a modified version of Firefox ESR (Extended Support Release). Firefox is available for Windows, macOS and Linux operating systems, with its mobile version available for Android and iOS.

A firewall is a network security system that monitors and controls incoming and outgoing network traffic. This traffic filter is based on predetermined rules. A firewall typically establishes a barrier between a trusted, secure internal network and another outside network but it can also be used as a content filter in the sense of censorship. Sometimes people have trouble connecting to Tor because their firewall blocks Tor connections. You can reconfigure or disable your firewall and restart Tor to test this.

FTE (format-transforming encryption) is a pluggable transport that disguises Tor traffic as ordinary web (HTTP) traffic.

GetTor is a service that automatically responds to messages (Email, Telegram) with links to the latest version of Tor Browser, hosted at a variety of locations, such as Dropbox, Google Drive and GitHub.

Spelling notes:

The second T is capitalized when possible: GetTor.

Translation notes:

Do not translate.

The Tor Project participates in the Google Summer of Code, which is a summer program for university students.

The Tor Project participates in the Google Season of Docs, which is a program for technical writers.

The first relay in the Tor circuit, unless using a bridge. When using a bridge, the bridge takes the place of the guard.

It's a icon with three horizontal lines usually on the top-left corner or top-right corner of the screen. By clicking or tapping on the icon, it reveals a menu with options or additional pages.

Reference: https://en.wikipedia.org/wiki/Hamburger_button


A cryptographic hash value is the result of a mathematical algorithm that maps data to a bit string of a fixed size. It's designed as one-way-function which means the value is easy to calculate in one direction but infeasible to invert. Hash values serve to verify the integrity of data.

Former name for "onion services", sometimes still in use in Tor documentation or communication.

The Hypertext Transfer Protocol (HTTP) is a channel used to send files and data between devices on a network. Originally used to transfer only web pages, it is now relied upon to deliver many forms of data and communication.

Hypertext Transfer Protocol Secure is the encrypted version of the HTTP channel used to transfer files and data between devices on a network.

HTTPS Everywhere is a Firefox, Chrome, and Opera extension that makes HTTPS the default on websites that have set up HTTPS but have not made it the default. HTTPS Everywhere is installed in Tor Browser for Android.

Since Tor Browser 11.5, HTTPS-Only Mode is enabled by default for desktop, and HTTPS Everywhere is no longer bundled with Tor Browser.

An Internet service provider (ISP) is an organization that provides services for accessing and using the Internet. When using Tor Browser, your ISP cannot see what websites you're visiting.

JavaScript is a programming language that websites use to offer interactive elements such as video, animation, audio, and status timelines. Unfortunately, JavaScript can also enable attacks on the security of the web browser, which might lead to deanonymization. The NoScript extension in Tor Browser can be used to manage JavaScript on different websites.

"little-t tor" is one way of referring to tor the network daemon, as opposed to Tor Browser or Tor Project.

These pluggable transports all make it look like you are browsing a major web site instead of using Tor. Meek-azure makes it look like you are using a Microsoft web site.

The middle position in the Tor circuit. Non-exit relays can function as either a "middle" or a "guard" for different users.

Moat is an interactive tool you can use to get bridges from within Tor Browser. It uses domain fronting to help you circumvent censorship. Moat also employs a Captcha to prevent a censor from quickly blocking all of the bridges.

Click here, to read more about using moat in the Tor Browser manual.

Sometimes the direct access to the Tor network is blocked by your Internet Service Provider (ISP) or by a government. Tor Browser includes some circumvention tools for getting around these blocks, including bridges, pluggable transports, and GetTor.

Tor Browser includes an add-on called NoScript, accessed by clicking the hamburger menu ("≡") at the top-right of the screen, then navigating to "Add-ons". NoScript allows you to control the JavaScript that runs on individual web pages, or to block it entirely.

The anonymizing relay monitor (formerly arm, now nyx) is a terminal status monitor for Tor, intended for command-line usage. This is a tool for monitoring the core Tor process on a system, often useful for relay operators.

Obfs3 is a pluggable transport that makes Tor traffic look random, so that it does not look like Tor or any other protocol. Obfs3 is not supported anymore.

Obfs4 is a pluggable transport that makes Tor traffic look random like obfs3, and also prevents censors from finding bridges by Internet scanning. Obfs4 bridges are less likely to be blocked than obfs3 bridges.

A standardized Internet domain name used by onion services that end in .onion and is designed to be self-authenticating.

Translation notes:

Can be partially or totally translated, i.e. for Spanish 'dirección cebolla' or 'dirección onion'. But be careful when translating, because the actual onion addresses finish with .onion, in English.

An iOS app which is open source, uses Tor routing, and is developed by someone who works closely with the Tor Project. পেঁয়াজের ব্রাউজার সম্পর্কে আরও জানুন

Translation notes:

Project name. Do not translate "Onion", however you can translate "Browser". Ex: Navegador Onion.

An onion site is websites that is only accessible via Tor. Although similar in meaning to onion service, but, onion site refers exclusively to websites. These websites use the .onion Top Level Domain (TLD).

Onionoo is a web-based protocol to learn about currently running Tor relays and bridges. Onionoo provides the data for other applications and websites (metrics.torproject.org) which in turn present Tor network status information to humans.

The set of available onion services. For example, you can say "my site is in onionspace" instead of "my site is in the Dark Web."

OONI stands for "Open Observatory of Network Interference", it is a global observation network for detecting censorship, surveillance and traffic manipulation on the internet.

The main system software that manages computer hardware and software resources and provides common services for computer programs. The most used desktop operating systems are Windows, macOS and Linux. Android and iOS are the dominant mobile operating systems.

Tools that Tor can use to disguise the traffic it sends out. This can be useful in situations where an Internet Service Provider (ISP) or other authority is actively blocking connections to the Tor network.

The private portion of a public/private key pair. This is the key that must be kept private, and not disseminated to others.

The public portion of a public/private key pair. This is the key that can be disseminated to others.

A public-key cryptography system uses pairs of mathematical keys. The public key can be disseminated widely while its corresponding private key is known only by the owner of the key pair. Any person can encrypt a message using the public key of the receiver but only the receiver in possession of the private key is able to decrypt the message. Additionally, the private key can be used to create a signature to prove the identity of the creator of a message or other files. This signature can be verified by the public key.

In public key cryptography, a public key fingerprint is a sequence of bytes that is used to identify and authenticate a corresponding longer public key.

Quickstart connects Tor Browser to the Tor Network automatically when launched, based on the last used connection settings.

It is an add-on for the Chrome or Chromium browsers that allows you to download several security and privacy programs, including Tor Browser, from different sources.

Element used for offering dynamic/interactive content via websites.

Secure sockets layer (SSL) is a standard Internet security protocol that is used to secure an internet connection and protect sensitive data being transmitted between two systems. SSL encrypts data that is being transferred, preventing third parties from accessing the data as it is being sent.

The specialized address format of onion addresses is self-authenticating. The format automatically guarantees that the onion address is bound to the key used to protect connections to the onion site. Ordinary internet domain names require site owners to trust and be approved by a Certificate Authority (CA) for this binding, and they are subject to hijack by the CA and typically by many other parties as well.

A device on a network that offers a service, such as file and web page storage, email or chat.

A session refers to a conversation between two devices communicating on a network. Using Tor Browser means that your session data will be wiped when you close the web browser.

A single onion service is an onion service that can be configured for services that do not require anonymity, but want to offer it for clients connecting to their service. Single onion services use only three hops in the circuit rather than the typical six hops for onion services.

Snowflake is a pluggable transport which provides censorship circumvention and access to a free and open internet. It has three components; the Snowflake client, the Snowflake proxy (the two together known as the Snowflake peers) and the broker. Snowflake can allow an open browser tab to act as an ephemeral Tor bridge. In order to prevent the blocking of proxy IP addresses, Snowflake involves a large number of volunteer proxies, which also makes them hard to pin point.

SOCKS5 is an Internet protocol used by Tor. It sends the traffic through the Tor network instead of sending it from your IP address into the open network. It is a general purpose proxy that sits at the layer 5 of the OSI model and uses the tunneling method. The applications that you run with SOCKS5 will be aware of the tunneling, but you can prevent identity correlation if set up correctly.

Spelling notes:

All in caps, as it is an acronym.

Stem is a Python (programming language) controller library for core Tor. If you want to control core Tor with python, this is for you.

The Sybil attack in computer security is an attack wherein a reputation system is subverted by creating a large number of identities, and using them to gain a disproportionately large influence in the network.

Tails is a "live" operating system, that you can start on almost any computer from a DVD, USB stick, or SD card. It aims to preserve your privacy and anonymity. Learn more about Tails.

The Guardian Project is a group of software developers, activists and designers that create easy to use, secure, opensource mobile apps and operating system enhancements. The Orbot app provided by The Guardian Project helps route other apps on your andriod device over the Tor network.

Most websites use numerous third-party services, including advertising and analytics trackers, which collect data about your IP address, web browser, system and your browsing behavior itself, all of which can link your activity across different sites. Tor Browser prevents a lot of this activity from happening.

Tor is a program you can run on your computer that helps keep you safe on the Internet. It protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, and it prevents the sites you visit from learning your physical location. This set of volunteer relays is called the Tor network. Sometimes the software associated with this network is called Core Tor, and sometimes "little-t tor". The way most people use Tor is with Tor Browser which is a version of Firefox that fixes many privacy issues.

When you run Tor Browser for the first time, you see the Tor Launcher window. It offers you the option to connect directly to the Tor network, or to configure Tor Browser for your connection. In the second case, Tor Launcher will take you through a series of configuration options.

Tor launcher is no longer used in Tor Browser since the 10.5 release.

Translation notes:

Do not translate or transliterate.

"Tor log" is an automatically-generated list of Tor’s activity that can help diagnose problems. When something goes wrong with Tor, you may see an option with the error message to "copy Tor log to clipboard". You should see an option to copy the log to your clipboard, which you can then paste to a document to show whoever is helping you troubleshoot.

If you don't see this option and you have Tor Browser open, you can navigate to the hamburger menu ("≡"), then click on "Settings", and finally on "Connection" in the side bar. At the bottom of the page, next to the "View the Tor logs" text, click the button "View Logs...".

Tor Messenger was a cross-platform chat program that aimed to be secure by default and send all of its traffic over Tor. Tor Messenger is not in development anymore. It supported Jabber (XMPP), IRC, Google Talk, Facebook Chat, Twitter, Yahoo, and others; enabled Off-the-Record (OTR) Messaging automatically; and had an easy-to-use graphical user interface localized into multiple languages.

Tor2web is a project to let users access onion services without using the Tor Browser. NOTE: This is not as safe as connecting to the onion services via Tor Browser, and will remove all Tor-related protections the client would otherwise have.

Torsocks allows you to use many applications in a safer way with Tor. It ensures that DNS requests are handled safely and explicitly rejects any traffic other than TCP from the application you're using.

People on IRC often use tpo to abbreviate torproject.org when writing hostnames. For example, blog.tpo is an abbreviation for blog.torproject.org.

A web browser (commonly referred to as a browser) is a software application for retrieving, presenting, and browsing information resources on the World Wide Web. Major web browsers include Firefox, Chrome, Internet Explorer, and Safari.

A website mirror is a one-to-one copy of a website that you can find under other web addresses. A current list of torproject.org mirrors is available at https://www.torproject.org/getinvolved/mirrors.html.en.

Orbot is a free app from The Guardian Project that empowers other apps on your device to use the internet more securely. Orbot uses Tor to encrypt your Internet traffic and hide it by bouncing through a series of computers around the world.

অ্যাটলাস এমন একটি ওয়েব অ্যাপ্লিকেশন যার মাধ্যমে বর্তমানে চলমান টর রিলেসমূহ সম্পর্কে জানা যায়।

ওয়েব ব্রাউজারে অ্যাডঅন, এক্সটেনশন ও প্লাগইন ইন্সটল করে ব্রাউজারে নতুন নতুন ফিচার যোগ করা যায়। Tor Browser comes with one add-on installed: NoScript. টর ব্রাউজারে আপনার আর কোনো অ্যাডঅন ইন্সটল করা উচিত নয়, কারণ তাতে এর গোপনীয়তা-সংক্রান্ত বিভিন্ন ফিচারের কাজে বিঘ্ন ঘটতে পারে।

ক্ষতিকর সফটওয়্যারের প্রভাব ঠেকাতে এবং সেগুলো খুঁজে বের করতে ও মুছে ফেলতে অ্যান্টিভাইরাস সফটওয়্যার ব্যবহৃত হয়। অ্যান্টিভাইরাস সফটওয়্যার কম্পিউটারে টর চলার ক্ষত্রে বাধা দিতে পারে। টরকে চলতে দেবার অনুমতি কীভাবে দিতে হবে তা জানা না থাকলে আপনাকে সম্ভবত আপনার অ্যান্টিভাইরাস সফটওয়্যারটির ডকুমেন্টেশন দেখতে হবে।

ক্লায়েন্ট যে অ্যাপ্লিকেশন ওয়েব ব্রাউজারে চালায় তাকে ওয়েব অ্যাপ্লিকেশন (ওয়েব অ্যাপ) বলা হয়। মোবাইলের অপারেটিং সিস্টেমে যেসব সফটওয়্যার ইন্সটল করা হয় সেগুলোকেও অ্যাপ বলে।

An Internet Protocol address (IP address) is a numerical (or alpha-numeric in the case of IPv6) label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication. The IP address is the location address of the device, similar to the addresses of physical locations. Tor Browser obscures your location by making it look like your traffic is coming from an IP address that is not your own.

This option is useful if the exit you are using is unable to connect to the website you require, or is not loading it properly. Selecting it will cause the currently active tab or window to be reloaded over a new Tor circuit. Other open tabs and windows from the same website will use the new circuit as well once they are reloaded. This option does not clear any private information or unlink your activity, nor does it affect your current connections to other websites.

Onion services (formerly known as “hidden services”) are services (like websites) that are only accessible through the Tor network. Onion services offer advantages over ordinary services on the non-private web, including: location hiding, end-to-end authentication, end-to-end encryption, and NAT punching.

টরের ভাষায়, টর নেটওয়ার্ক যেসব রিলে নিয়ে গঠিত সেগুলো সম্পর্কে সব ক্লায়েন্টের কাছে যেন একই তথ্য থাকে তা নিশ্চিত করার জন্য এক ঘন্টা পর পর ডিরেক্টরি কর্তৃপক্ষগুলোর তৈরি ও সেগুলোর ভোটে নির্ধারিত একটি ডকুমেন্ট।

ক্যাপচা হচ্ছে কম্পিউটার-সংক্রান্ত ক্ষেত্রে ব্যবহৃত এমন একটি প্রশ্নোত্তরভিত্তিক (চ্যালেঞ্জ-রেসপন্স) পরীক্ষা যার মাধ্যমে নির্ণয় করা হয় ব্যবহারকারী আসলে মানুষ কি না। টর ব্যবহারকারীদেরকে প্রায়ই ক্যাপচার সমাধান করতে হয়, কারণ টর রিলেগুলো থেকে এত বেশি রিকোয়েস্ট পাঠানো হয় যে, অনেক ওয়েবসাইটই সহজে বুঝে উঠতে পারে না সেগুলো আসলে কোনো মানুষ পাঠাচ্ছে নাকি কোনো বট।

Spelling notes:

"Captcha"-র শুধু প্রথম বর্ণ বড় হাতের অক্ষরে হবে, কারণ এটি এখন ইংরেজিতে বিশেষ্য (noun) হিসাবে বিবেচিত

ক্রস-সাইট স্ক্রিপ্টিংয়ের (XSS) মাধ্যমে আক্রমণকারী, স্বাভাবিক অবস্থায় থাকার কথা নয় এমন ক্ষতিকর ক্ষমতা বা আচরণ কোনো ওয়েবসাইটে যোগ করতে পারে।

A cryptographic signature proves the authenticity of a message or file. It is created by the holder of the private portion of a public key cryptography key pair and can be verified by the corresponding public key. If you download software from torproject.org, you will find it as signature files (.asc). These are PGP signatures, so you can verify that the file you have downloaded is exactly the one that we intended you to get. For more information, see how you can verify signatures.

টরের ক্ষেত্রে ক্লায়েন্ট বলতে টর নেটওয়ার্কের এমন একটি নোডকে বোঝায় যা সাধারণত একজন ব্যবহারকারীর পক্ষ থেকে চলে এবং যা পর পর কয়েকটি রিলের মধ্য দিয়ে অ্যাপ্লিকেশনের সংযোগ ঘুরিয়ে আনে।

চেকসাম হচ্ছে ফাইলের হ্যাশ মান। সফটওয়্যার যদি কোনরকম ত্রুটি ছাড়াই ঠিকমতো ডাউনলোড করে থাকেন তাহলে আপনার ডাউনলোড করা ফাইলের চেকসাম প্রদত্ত চেকসামের সাথে পুরোপুরি মিলে যাবে।

Tor Metrics (.onion) archives historical data about the Tor ecosystem, collects data from the public Tor network and related services, and assists in developing novel approaches to safe, privacy preserving data collection.

The Tor Project can refer to either The Tor Project Inc, a 501(c)3 US nonprofit responsible for maintaining the Tor software, or the Tor Project community made up of thousands of volunteers from all over the world who help create Tor.

Tor Browser uses the Tor network to protect your privacy and anonymity. Your internet activity, including the names and addresses of the websites you visit, will be hidden from your Internet Service Provider (ISP) and anyone watching your connection locally. The operators of the websites and services that you use, and anyone watching them, will see a connection coming from the Tor network instead of your real (IP) address, and will not know who you are unless you explicitly identify yourself. In addition, Tor Browser is designed to prevent websites from “fingerprinting” or identifying you based on your browser configuration. By default, Tor Browser does not keep any browsing history. Cookies are only valid for a single session (until Tor Browser is exited or a New Identity is requested).

Spelling notes:

Tor Browser. Sometimes also mentioned as tbb. Not 'TOR Browser'.

Translation notes:

Do not translate "Tor", however you can translate "Browser". Example in Spanish: Navegador Tor (altering the order because is more natural like that in Spanish.) Some languages such as Arabic transliterate the word Tor, تور. That is, they write Tor with other characters.

A daemon is a computer program that runs as a background process, rather than being under the direct control of a user.

New Identity is a Tor Browser feature if you want to prevent your subsequent browser activity from being linkable to what you were doing before. Selecting it will close all your open tabs and windows, clear all private information such as cookies and browsing history, and use New Tor circuits for all connections. Tor Browser will warn you that all activity and downloads will be stopped, so take this into account before clicking “New Identity” (accessible through the small sparkly broom icon at the top-right of the screen). New Identity can also help if Tor Browser is having trouble connecting to a particular site, similarly to "New Tor Circuit for this Site".

A proxy is a middle man between a client (like a web browser) and a service (like a web server). Instead of connecting directly to the service, a client sends the message to the proxy. The proxy makes the request on behalf of the client, and passes the response back to the client. The service only communicates with and sees the proxy.

Flash Player is a browser plugin for Internet applications to watch audio and video content. You should never enable Flash to run in Tor Browser as it is unsafe. Many services that use Flash also offer an HTML5 alternative, which should work in the Tor Browser.

দৈবচয়নে নির্বাচিত নোড ব্যবহার করে কয়েকটি ক্লায়েন্ট নিয়ে টর নেটওয়ার্কের মধ্য দিয়ে তৈরি একটি পথ। বর্তনীর শুরুতে থাকে একটি সেতু কিংবা একটি রক্ষী। অধিকাংশ বর্তনীতে মোট নোড থাকে তিনটি - একটি রক্ষী বা সেতু, একটি মধ্যরিলে ও একটি বহির্মুখী রিলে। অধিকাংশ অনিয়ন সেবার ক্ষেত্রে (একক অনিয়ন সেবা ছাড়া বাকি ক্ষেত্রে) বর্তনীতে ছয়বার "লাফ" দেওয়া হয়, আর সেসবে কখনও বহির্মুখী কোনো নোড থাকে না। ইউআরএল বারের [i] চিহ্নের ওপর ক্লিক করে নিজের বর্তমান টর বর্তনী দেখা যায়।

To determine a relay's throughput, special relays called bandwidth authorities take periodic measurements of the relays in the consensus.

কোনো ডিভাইস বা সেবার পরিচয় বা বৈশিষ্ট্য আন্দাজ করে বের করার জন্য তা সম্পর্কে তথ্য সংগ্রহ করার প্রক্রিয়াকে ফিঙ্গারপ্রিন্টিং বলা হয়। আচরণ বা রিকোয়েস্টের জবাবের অনন্যতার ওপর ভিত্তি করে ফিঙ্গারপ্রিন্টিংয়ের লক্ষ্যবস্তু ডিভাইস বা সেবার পরিচয় বের করে ফেলা সম্ভব। টর ব্রাউজার ফিঙ্গারপ্রিন্টিং প্রতিরোধ করে।

ওয়েব ব্রাউজার ব্যবহার করার সময় যেসব রিকোয়েস্ট পাঠানো হয় সেসবের রেকর্ডকেই বলা হয় ব্রাউজিংয়ের ইতিহাস। কোন কোন ওয়েবসাইটে কখন কখন যাওয়া হয়েছে ইত্যাদি সব তথ্যই এর অন্তর্ভুক্ত। সেশন শেষ করে দিলে টর ব্রাউজার থেকে ব্রাউজিংয়ের ইতিহাস মুছে যায়।

A publicly-listed node in the Tor network that forwards traffic on behalf of clients, and that registers itself with the directory authorities.

সাধারণ টর রিলের মতো সেতুর দেখাশোনাও স্বেচ্ছাসেবকরাই করে থাকেন; তবে সাধারণ রিলের মতো সেতুর তালিকা প্রকাশ্যে কোথাও দেওয়া থাকে না, আর তাই কোনো অহিতাকাঙ্ক্ষী সহজে সেগুলো শনাক্ত করতে পারে না। টর যে ব্যবহার করা হচ্ছে তা কাউকে বুঝতে দিতে না চাইলে প্লাগেবল ট্রান্সপোর্ট নামের এক ধরনের সেতু ব্যবহার করা যায়।

বিশেষ উদ্দেশ্যে ব্যবহৃত এমন এক ধরনের রিলে যেখানে সেতুগুলোরতালিকা থাকে।