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  2. Call sign - Wikipedia

    en.wikipedia.org/wiki/Call_sign

    Amateur radio call signs are in the international series and normally consist of a one or two character prefix, a digit (which may be used to denote a geographical area, class of license, or identify a licensee as a visitor or temporary resident), and a 1-, 2-, or 3-letter suffix. In Australia, call signs are structured with a two letter prefix ...

  3. Amateur radio call signs - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_call_signs

    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.

  4. Call signs in Canada - Wikipedia

    en.wikipedia.org/wiki/Call_signs_in_Canada

    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).

  5. International Code of Signals - Wikipedia

    en.wikipedia.org/wiki/International_Code_of_Signals

    In some cases, additional characters are added to indicate quantities, bearing, course, distance, date, time, latitude, or longitude. There is also provision for spelling words and for indicating use of other codes. Several of the most common single-letter signals are shown at the right. Two-letter signals cover a broad gamut of situations.

  6. List of U.S. state and territory abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_and...

    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 ...

  7. English prefix - Wikipedia

    en.wikipedia.org/wiki/English_prefix

    The first prefix un-"not" is attached to adjective and participle bases while the second prefix un-"reverse action" is attached to either verb or noun bases. Thus, English can have two words that are pronounced and spelled the same and have the same lexical category but have different meanings, different prefixes, a different internal ...

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  9. Wikipedia:List of two-letter combinations - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:List_of_two...

    This list of all two-letter combinations includes 1352 (2 × 26 2) of the possible 2704 (52 2) combinations of upper and lower case from the modern core Latin alphabet. A two-letter combination in bold means that the link links straight to a Wikipedia article (not a disambiguation page).