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Tophour.com — Top-of-the-hour station identifications with call signs from American AM and FM radio stations; Military Callsign List; K/W Call Letters in the United States — A comprehensive historical review of K and W call letter assignments for AM band (mediumwave) radio stations in the United States
Although the term 12 is a police radio call code, urban slang has changed it into a warning phrase. Possible etymologies include 1312, the numeric representation of the acronym " ACAB " which stands for "all cops are bastards", as well as an account of the phrase deriving from the 1970s television show Adam-12 .
ISO 3166-1 alpha-2 – two-letter country codes which are also used to create the ISO 3166-2 country subdivision codes and the Internet country code top-level domains. ISO 3166-1 alpha-3 – three-letter country codes which may allow a better visual association between the codes and the country names than the 3166-1 alpha-2 codes.
A shackle code is a cryptographic system used in radio communications on the battle field by the US military, the Rhodesian Army, and the Canadian Army, among other English speaking militaries which might not distribute or require sophisticated one-time use pads. It is specialized for the transmission of numerals.
One or more flags form a code word whose meaning can be looked up in a code book held by both parties. An example is the Popham numeric code used at the Battle of Trafalgar . In yacht racing and dinghy racing , flags have other meanings; for example, the P flag is used as the "preparatory" flag to indicate an imminent start, and the S flag ...
Supermarine Spitfire Mk Vb of the Polish 303 Kościuszko Squadron showing the RAF squadron code "RF" of 303 Squadron and the individual aircraft letter "D" which would be spoken, D-Dog Instruction page from WW I U.S. Army trench code, Seneca edition, with spelling alphabet for telephone and radio use
The Hundred Code is a three-digit police code system. [3] This code is usually pronounced digit-by-digit, using a radio alphabet for any letters, as 505 "five zero five" or 207A "two zero seven Alpha".
The codes are intended for use by air, ground, sea, and space operations personnel at the tactical level. Code words that are followed by an asterisk (*) may differ in meaning from NATO usage. There is a key provided below to describe what personnel use which codes, as codes may have multiple meanings depending on the service.