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These mimicked an earlier railroad telegraph convention where short, two-letter identifiers served as Morse code abbreviations to denote the various individual stations on the line (for instance, AX could represent Halifax). "N" and two letters would identify U.S. Navy; "M" and two letters would be a Marconi station.
Russian nuclear icebreaker Arktika with call sign UKTY. Merchant and naval vessels are assigned call signs by their national licensing authorities. In the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters (for example, 3LXY, and sometimes followed by a number, e.g. 3LXY2).
Some abbreviations are a mixture of syllabic abbreviation and acronym. These are usually pronounced as words and considered to be acronyms overall. For example, radar for radio detection and ranging, consisting of syllabic abbreviation ra for radio and acronym dar for detection and ranging..
Abbreviations: German written abbreviations are often punctuated and are pronounced as the full word when read aloud, such as beispielsweise for bspw. ("for example"). Unlike English, which is moving away from periods in abbreviations in some style guides, the placement of capital letters and periods is important in German. [1]
The traditional abbreviations for U.S. states and territories, widely used in mailing addresses prior to the introduction of two-letter U.S. postal abbreviations, are still commonly used for other purposes (such as legal citation), and are still recognized (though discouraged) by the Postal Service.
In the 1970s the abbreviation BA was the ICAO code and the IATA code of British Airways, while non-IATA members like Court Line used their two-letter abbreviation as ICAO code only. In 1982 ICAO introduced the current three-letter system due to the increasing number of airlines.
Aeronautical Radio Inc: ROCKFISH|United States VUO Aerovuelox: AEROVUELOX Mexico VTM Aeronaves TSM: AERONAVES TSM Mexico VU VUN Air Ivoire: AIRIVOIRE Ivory Coast defunct BP BOT Air Botswana: BOTSWANA Botswana XPR Air-Rep: United States XLL Air Excel: TINGA-TINGA Tanzania VAE Air Evans: AIR-EVANS Spain Ecuela de Pilotos Privados WHY Air Sorel ...
CQ call of German amateur radio station DG2RBH on the 80 m band ("Hello CQ from Delta Golf 2 Romeo Bravo Hotel") CQ is a station code used by wireless operators derived from long established telegraphic practice on undersea cables and landlines, particularly used by those communicating in Morse code, ( ), but also by voice operators, to make a general call (called a CQ call).