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Individual stations selected their own call signs, commonly only one or two letters, with little concern about duplication. The first U.S. organization to conform to the international standard was the U.S. Navy, which in 1909 switched from two-letter calls scattered throughout the alphabet to three-letter calls, all starting with the letter "N ...
PNSS, 1×2 call sign prefix always a letter, suffix almost always two letters to avoid confusion with 2×1 call signs. As a precaution, the ITU has issued no prefixes in the B, F, G, I, K, M, N, R or W block ranges with letter-number possibilities, meaning that the first digit would have to be the separating numeral anyway.
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
The Canadian federal government's Innovation, Science and Economic Development Canada allots the individual call signs to the radio amateurs it licenses. There are 24 possible 2-letter prefixes and 240 2-letter/1-number prefixes available to Canadian operators based on the ITU blocks (CF–CK, CY–CZ, VA–VG, VO, VX–VY and XJ–XO).
Letter frequencies, like word frequencies, tend to vary, both by writer and by subject. For instance, d occurs with greater frequency in fiction, as most fiction is written in past tense and thus most verbs will end in the inflectional suffix -ed / -d. One cannot write an essay about x-rays without using x frequently. Different authors have ...
ISO 3166 codes (2-letter, 3-letter, and 3-digit codes from ISO 3166-1; 2+2-letter codes from ISO 3166-2) ANSI: 2-letter and 2-digit codes from the ANSI standard INCITS 38:2009 (supersedes FIPS 5-2) USPS: 2-letter codes used by the United States Postal Service USCG: 2-letter codes used by the United States Coast Guard (bold red text shows ...
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To classify electric stock, a two-letter prefix was used to indicate what type it was, followed by a number issued sequentially from 1. This was a system adapted from that used by the LNER for its electric stock (e.g. EM1, see here). The additional prefixes used were: AL: AC electric locomotive; AM: AC electric multiple unit