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Sounds used on passenger trains for communication between the driver and guard
Bell codes, buzzer codes or Communication Signal Appliance codes entail a series of bells or buzzers used on passenger trains for communication between
Bell_code
Device control code used to alert operators
A bell character (sometimes bell code) is a device control code originally sent to ring a small electromechanical bell on tickers and other teleprinters
Bell_character
Telephone area codes for Toronto, Ontario
incumbent local exchange carrier in the NPA is Bell Canada. Almost all Toronto Bell Canada landlines have area code 416, with 647 numbers allocated disproportionately
Area codes 416, 647, 437, and 942
Area_codes_416,_647,_437,_and_942
British railway signalling scheme
to enter the section. This communication traditionally takes place by bell codes and status indications transmitted over a simple telegraph wire circuit
Absolute_block_signalling
Area codes in the Los Angeles metropolitan area
such as Bell and Huntington Park. Area code 213 was one of the original North American area codes of 1947 and 323 was created in an area code split of
Area_codes_213,_323,_and_738
British railway signalling system
The railway block signalling bell code is a system of bell sounds used in Great Britain to communicate between manually operated Signal Boxes in implementing
Railway_block_code
Telephone area codes for Montreal
Montreal area. Area code 263 was added to the overlay in October 2022. The incumbent local exchange carrier (ILEC) in the service area is Bell Canada. The major
Area_codes_514,_438,_and_263
British railway slang
the guard of a train standing at a platform gives a "ready to start" bell code to the driver, when the platform starting signal is at danger, and the
Ding-ding,_and_away
Area codes in southern Florida
3B. "Area code 786 is coming to the Florida Keys". Bell South. The Stuart News (Stuart, Florida). September, 1 2001. p. 9. "NANP Area Code History: 1998"
Area_codes_305,_786,_and_645
Integrated telephone numbering plan of twenty North American countries
Calling Being Introduced In Bell System, Bell Laboratories Record 38(12) p.470 (December 1960) "Numbering Resources: NPA (Area) Codes". NANP. Neustar. Archived
North_American_Numbering_Plan
country codes are telephone number prefixes for reaching subscribers in foreign countries or areas by international direct dialing (IDD). Country codes are
List of telephone country codes
List_of_telephone_country_codes
Chamber for transporting divers vertically through the water
open-bottomed wet bell and the closed bell, which can maintain an internal pressure greater than the external ambient. Diving bells are usually suspended
Diving_bell
Form of color code used in wiring
The 25-pair color code, originally known as even-count color code, is a color code used to identify individual conductors in twisted-pair wiring for telecommunications
25-pair_color_code
Research and scientific development company
Nokia Bell Labs, commonly referred to as Bell Labs, is an American industrial research and development company owned by the Finnish technology company
Bell_Labs
List of all telephone area codes in California
As of March 2025, the U.S. state of California is served by 41 area codes in the North American Numbering Plan. In 1947, the American Telephone and Telegraph
List_of_California_area_codes
Area codes in New Jersey, United States
Dialing (company guide). New Jersey Bell. March 26, 1961. p. 2. "New Jersey Bell customers will begin using area codes". Red Bank Register. June 20, 1963
Area_codes_201_and_551
Railway signalling system
station A sends a bell code to station B asking if line is clear for the train If clear, operator at station B will repeat the bell code to acknowledge Station
Tyer's_Electric_Train_Tablet
Research distributed operating system
Plan 9 from Bell Labs is an operating system designed by the Computing Science Research Center (CSRC) at Bell Labs in the mid-1980s, built on the UNIX
Plan_9_from_Bell_Labs
Pioneering five-bit character encodings
adding more control codes. An explicit SPC (space) character was introduced, in place of the BLANK/NULL, and a new BEL code rang a bell or otherwise produced
Baudot_code
Telephone area code history of North America
assignment of area codes is shown in the following tabulation. This method of arrangement, which is known to have been in use at Bell Laboratories, shows
Original North American area codes
Original_North_American_area_codes
Inventor of the telephone (1847–1922)
Alexander Graham Bell (/ˈɡreɪ.əm/ ; born Alexander Bell; March 3, 1847 – August 2, 1922) was a Scottish-born Canadian-American inventor, scientist, and
Alexander_Graham_Bell
Telephone area codes in central and southeastern New Jersey
New Jersey Bell. March 26, 1961. p. 2. "New Jersey Bell customers will begin using area codes". Redbank Register. June 20, 1963. New Area Code Assigned
Area_codes_609_and_640
Area codes for Quebec, Canada
Bell Canada areas in the Northwest Territories. Ontario and Quebec were the only Canadian provinces that received assignments of multiple area codes from
Area_codes_819,_873,_and_468
Coded messages used over public address systems on passenger ships
form of blasts on alarm bells, sounds on the ship's whistle or code names paged over the PA system. Alpha, alpha, alpha is the code for a medical emergency
Vessel_emergency_codes
Telephone area codes for Northern Virginia, United States
Area codes 703 and 571 are telephone area codes in the North American Numbering Plan (NANP) for Northern Virginia, including the independent cities of
Area_codes_703_and_571
Transmission of language with brief pulses
Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes
Morse_code
Area codes for Washington, D.C.
Area codes 202 and 771 are telephone area codes in the North American Numbering Plan (NANP) for Washington, D.C. Area code 202 was one of the original
Area_codes_202_and_771
Mechanical bell that functions by means of an electromagnet
single-stroke bell, the bell will ring once and then stop. It will not ring again until power is turned off and on again. These were frequently used with coded pull
Electric_bell
Computer control characters
accepts ALERT and BEL (but not BELL) as formal aliases for the control character, although the code chart still lists BELL as the ISO 6429 alias, and the
C0_and_C1_control_codes
Musical artist
Renick Bell is an American musician, programmer, and teacher based in Saigon,Vietnam, notable as a pioneer of live coded music performance including at
Renick_Bell
Traditional first example of a computer programming language
printed out or displayed on a screen (often a console). A small piece of code in most general-purpose programming languages, this program is used to illustrate
Hello,_world
Area code in New York City
Bronx". The New York Times. June 5, 1990. "Bell Atlantic Ready to Introduce New 347 Area Code; New Area Code to Join 718 to Serve The Bronx, Brooklyn,
Area_code_917
New Jersey, United States area codes
Bell. March 26, 1961. p. 2. "New Jersey Bell customers will begin using area codes". Red Bank Register. June 20, 1963. Newman, Andy. "New Area Codes Introduced"
Area_codes_732_and_848
Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local
List of North American Numbering Plan area codes
List_of_North_American_Numbering_Plan_area_codes
North American local directory assistance number
The Bell System selected 1 for this purpose. However, because 113 was already used for directory assistance, along with other 11x service codes (for
411_(telephone_number)
Group of related team sports
in England, wrote a letter to Bell's Life in Victoria & Sporting Chronicle, calling for a "foot-ball club" with a "code of laws" to keep cricketers fit
Football
Code point in a character set, that does not represent a written symbol
there are 33 control characters, such as code 7, BEL, which might ring a bell. Procedural signs in Morse code are a form of control character. A form of
Control_character
Area code in southern California
portion of the old 213 territory, Pacific Bell chose to move all of GTE's area code 213 exchanges into the 310 area code. As the primary telephone provider in
Area_code_562
Theorem in physics
Bell's theorem is a term encompassing a number of closely related results in physics, all of which determine that quantum mechanics is incompatible with
Bell's_theorem
1915 railway accident in Scotland
signalling procedure occurred. Firstly, as soon as the "train out of section" bell code had been telegraphed to Kirkpatrick signal box to advise that the empty
Quintinshill_rail_disaster
Telephone area codes for east Maryland
southern Maryland, including the Washington suburbs, would retain area code 301. Bell Atlantic (now Verizon), the largest telephone provider in the region
Area_codes_410,_443,_and_667
Numbers for Tomorrow's Telephones". Bell Telephone Monthly. 38 (4): 6. "New Jersey Bell customers will begin using area codes". Redbank Register. 1963-06-20
List_of_New_Jersey_area_codes
of a three-digit area code, a three-digit central office code, also known as exchange code, and a four-digit station or line code. This is represented
Telephone_numbers_in_Canada
American mathematician and information theorist (1915–1998)
Hamming, Richard W. (1950). "Error detecting and error correcting codes" (PDF). Bell System Technical Journal. 29 (2): 147–160. doi:10.1002/j.1538-7305
Richard_Hamming
Software that translates code from one programming language to another
In computing, a compiler is software that translates computer code written in one programming language (the source language) into another language (the
Compiler
Telephone area code for north-central New Jersey
since 1956. In June 1989, New Jersey Bell announced a split of numbering plan area 201 to create a new area code, 908, in North Jersey. During a permissive
Area_code_908
Bourne shell backward compatible Unix shell created by David Korn
Korn at Bell Labs in the early 1980s and announced at USENIX on July 14, 1983. The initial development was based on Bourne shell source code. Other early
KornShell
Telephone area code for Pittsburgh, Pennsylvania
Allegheny County was split into a new numbering plan area with area code 724. Bell Atlantic, the main telephone provider at the time in Pennsylvania, had
Area_code_412
American fast-food chain
Taco Bell Corporation, doing business as Taco Bell, is an American multinational chain of fast food restaurants founded in 1962 by Glen Bell (1923–2010)
Taco_Bell
Area code in western Pennsylvania
southwestern corner of Pennsylvania. The regional carrier Bell Atlantic wanted to implement area code 724 as an overlay complex with 412 at a time when overlays
Area_code_724
Tool to flag poor computer code
analysis on C language source code. The software gives its name to modern computing tools responsible for checking for coding style or formatting errors
Lint_(software)
American experimental aircraft
numbers 90060 and 90061, were designated L-39-1 and L-39-2, based on Bell's code letter "L" and the aircraft's model number "39". Both aircraft were fitted
Bell_L-39
Area codes in southern California
Area codes 714 and 657 are telephone area codes in the North American Numbering Plan (NANP) for the southern part of the U.S. state of California. The
Area_codes_714_and_657
Area code in Georgia, United States
complained about no longer being associated with the better-known area code 404, prompting BellSouth to return these areas to 404 soon after the split. However
Area_code_770
Telephone area code in Atlanta, Georgia
numbering plan area, Southern Bell (later BellSouth, now part of AT&T Inc.) introduced interchangeable central office codes, effective October 1, 1989.
Area_code_404
Ordering of binary values, used for positioning and error correction
binary code for non-negative integers, the binary-reflected Gray code, or BRGC. The Bell Labs researcher George R. Stibitz described such a code in a 1941
Gray_code
Canadian telecommunications company
Area codes 902 and 782 Area codes 506 and 428 Area code 709 Area codes 418 and 581 Area codes 819 and 873 Area codes 705 and 249 Area code 807 Bell Canada
Bell_Aliant
Area codes for south-central and most of southeastern Massachusetts
List of area codes in Massachusetts List of North American Numbering Plan area codes "Split of the 617 Numbering Plan Area (NPA)" (PDF). Bell Communications
Area_codes_508_and_774
Area code in Nassau County, New York
Way". Bell Telephone Magazine. 26 (4): 181. Retrieved April 23, 2022. Rather, John (October 31, 1999). "Suffolk County Gears Up for 631 Area Code". The
Area_codes_516_and_363
Area code in Texas, United States
This area code was therefore transitioned to ten-digit dialing by October 24, 2021. The counties served by this area code include: Bell County Bosque
Area_code_254
American telephone service monopoly (1877–1984)
The Bell System was a system of telecommunication companies, led by the Bell Telephone Company and later by the American Telephone and Telegraph Company
Bell_System
Character encoding standard
description of control-G (code 7, BEL, meaning audibly alert the operator) literally, as the unit contained an actual bell which it rang when it received
ASCII
Humorous aphorism in computer programming
takes both more time and more coding than expected to complete a project. The rule is attributed to Tom Cargill of Bell Labs, and was made popular by
Ninety–ninety_rule
Area codes that serve the southern San Francisco Bay Area, California
numbers using the 669 area code. Los Gatos is one of three cities in Santa Clara County that were not served by the Bell System. Gilroy and Morgan Hill
Area_codes_408_and_669
Telephone area codes in Los Angeles County, California, U.S.
Monte Nido San Fernando Topanga (mostly in the 310 area code) Universal City Westlake Village Bell Canyon North Ranch (part of Thousand Oaks/Westlake Village)
Area_codes_818_and_747
Quantum states of two qubits
more subsystems. Understanding of Bell's states is useful in analysis of quantum communication, such as superdense coding and quantum teleportation. These
Bell_state
Area codes in southern Ontario, Canada
Niagara Peninsula. The incumbent local exchange carrier is Bell Canada. From the 1960s, area code 905 was assigned for special call routing arrangements to
Area codes 905, 289, 365, and 742
Area_codes_905,_289,_365,_and_742
Procedural programming language
B is a programming language developed at Bell Labs circa 1969 by Ken Thompson and Dennis Ritchie. B was designed for recursive, non-numeric, machine-independent
B_(programming_language)
Area codes for Phoenix, Arizona, United States
preferred configuration. US West, formerly Mountain Bell, supported an overlay, in which a second area code would be added to the existing 602 area. This would
Area_codes_602,_480,_and_623
Fictional Nazi weapon
be highly radioactive, code-named 'Xerum 525.'" Cook recounts claims that "scientists and technicians who worked on the bell and who did not die of its
Die Glocke (conspiracy theory)
Die_Glocke_(conspiracy_theory)
Telephone area code for southwestern Ontario, Canada
codes 519, 226, 548, and 382 are telephone overlay area codes in the North American Numbering Plan (NANP) for most of southwestern Ontario. Area code
Area codes 519, 226, 548, and 382
Area_codes_519,_226,_548,_and_382
American actress
Corona, Atlanta, and Detroiters. She is best known for her portrayal of Wanda Bell on Snowfall (2018–2023) and also the Spin-off The Drop: A Snowfall Saga (2026)
Gail_Bean
Numbering method for assigning routing addresses for telephones
participants in a telephone network, reachable by a system of destination code routing. Telephone numbering plans are defined world-wide, as well as within
Telephone_numbering_plan
Technique used to encode voices in telephony
encoder. ADPCM was developed for speech coding by P. Cummiskey, Nikil S. Jayant and James L. Flanagan at Bell Labs in 1973. In telephony, a standard audio
Adaptive differential pulse-code modulation
Adaptive_differential_pulse-code_modulation
Study of the properties of codes and their fitness
in 1968 for his work at Bell Labs in numerical methods, automatic coding systems, and error-detecting and error-correcting codes. He invented the concepts
Coding_theory
Original Unix operating system from Bell Labs
to distinguish it from other versions internal to Bell Labs (such as PWB/UNIX and MERT) whose code-base had diverged from the primary CSRC version. However
Research_Unix
Unincorporated community in North Carolina, United States
United States. As of the 2020 census, Bell Arthur had a population of 477. Bell Arthur has a post office with ZIP code 27811. "ArcGIS REST Services Directory"
Bell_Arthur,_North_Carolina
2006 mystery thriller film by Ron Howard
The Da Vinci Code is a 2006 mystery thriller film directed by Ron Howard, written by Akiva Goldsman, and based on Dan Brown's 2003 novel of the same name
The_Da_Vinci_Code_(film)
NANP area codes for the Dominican Republic
Numbering Plan area codes Telecommunications in the Dominican Republic Sinks, William A. (1959). "New Numbers for Tomorrow's Telephones". Bell Telephone Magazine
Area_codes_809,_829,_and_849
Area codes for San Francisco and Marin County, California
codes List of North American Numbering Plan area codes Mabbs, Ralph I. (Winter 1947–1948). "Nation-wide Operator Toll Dialing—the Coming Way". Bell Telephone
Area_codes_415_and_628
North American telephone area codes in Western Maryland, U.S.
Telephone Company (C&P Telephone, later part of Bell Atlantic and now Verizon) cooperated in ending code protection for the Washington area on October 1
Area_codes_301,_240,_and_227
Huey family of American military utility helicopters
The Bell UH-1 Iroquois (nicknamed "Huey") is a utility military helicopter designed and produced by the American aerospace company Bell Helicopter. It
Bell_UH-1_Iroquois
Telephone area codes in Pennsylvania, United States
non-Bell telephone companies, which sought to consolidate their eastern Pennsylvania customers into one area code and would have had to change area codes
Area_codes_610,_484,_and_835
Telephone area code for the Canadian territories
independent telephone companies, and by Bell Canada.[citation needed] In 1947, Alberta was assigned area code 403 in the first continent-wide telephone
Area_code_867
Telephone area codes for the western East Bay of California
Area Code, New Dialing Procedure Coming To Alameda, Contra Costa Counties". KPIX-TV. June 21, 2019. Tyberghein, E.J. (July 1962). "TWX Goes Dial". Bell Laboratories
Area_codes_510_and_341
Location identification system in North American telecommunications
different area code (905 instead of 416) and different, multiple rate centres (Clarkson, Streetsville, Cooksville, Malton, Port Credit; Bell Canada has no
Common Language Location Identification
Common_Language_Location_Identification
Semi-submersible offshore drilling rig
the bell, the Norwegians having passed into the chamber through a trunk or passageway. The normal procedure would have been: Close the diving bell door
Byford_Dolphin
British train identifier
cab remains unaltered.[citation needed] "British Railway Bell Codes and Locomotive Head Codes". Archived from the original on 15 August 2018. Retrieved
Train_reporting_number
Telephone area code in east-central Virginia, United States
Hampton Roads became area code 757. Although Hampton Roads is the largest metropolitan area based in the Commonwealth, Bell Atlantic (forerunner of Verizon)
Area_codes_804_and_686
Area code in southern Arizona, United States
the state needed a second area code to satisfy population growth and increased demand for telephone numbers. Mountain Bell, the incumbent local exchange
Area_code_520
Country code: 64 International call prefix: 00 Trunk prefix: 0 New Zealand's telephone numbering plan divides the country into a large number of local
List of dialling codes in New Zealand
List_of_dialling_codes_in_New_Zealand
Area code for western Riverside County, California
area codes List of North American Numbering Plan area codes Mabbs, Ralph (Winter 1947–1948). "Nation-Wide Operator Toll Dialing—the Coming Way". Bell Telephone
Area_code_951
County in Texas, United States
Bell County is a county in the U.S. state of Texas. It is in Central Texas and its county seat is Belton. As of the 2020 census, its population was 370
Bell_County,_Texas
Unincorporated community in Pennsylvania, US
Bell is a census-designated place (CDP) in Whitpain Township, Pennsylvania, United States. As of the 2020 census, its population was 6,506. Blue Bell
Blue_Bell,_Pennsylvania
Telecommunication network interface
their invention at Bell Labs by 1973, the standard was first defined in the Universal Service Ordering Code (USOC) system of the Bell System in the United
Registered_jack
Area codes in southeastern Pennsylvania
but were served by non-Bell telephone companies which sought to consolidate their eastern Pennsylvania customers into one area code. This was intended as
Area_codes_215,_267,_and_445
Telephone area code for Tampa, Florida
2020. Retrieved August 25, 2020. DEMAND FORCES SOUTHERN BELL TO MAKE A SWITCH IN AREA CODES" The Orlando Sentinel, Sept. 1 1986 "Planning Letter 121:
Area_codes_813_and_656
Telephone area codes for Manitoba
area code for the region in February 2017. It was implemented on October 29, 2022. The incumbent local exchange carrier for the area codes is Bell MTS
Area_codes_204,_431,_and_584
Ranch in New Mexico, US
it is large enough to have its own zip code. Kiowa and Comanche ranged over the grassland that is now Bell Ranch. The ranch originated from a Mexican
Bell_Ranch
English traveller and writer
replicating its legal code and bureaucratic structure, and Bell's assessment was that this was keeping the Iraqi people content. Bell visited France and
Gertrude_Bell
travel, tourism, insurance
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travel, tourism, insurance