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  2. Prosigns for Morse code - Wikipedia

    en.wikipedia.org/wiki/Prosigns_for_Morse_code

    Even though represented as strings of letters, prosigns are rendered without the intercharacter commas or pauses that would occur between the letters shown, if the representation were (mistakenly) sent as a sequence of letters: In printed material describing their meaning and use, prosigns are shown either as a sequence of dots and dashes for the sound of a telegraph, or by an overlined ...

  3. Glossary of military abbreviations - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_military...

    Remove capital letters in case they are not needed. List of abbreviations , acronyms and initials related to military subjects such as modern armour, artillery, infantry, and weapons, along with their definitions.

  4. Morse code abbreviations - Wikipedia

    en.wikipedia.org/wiki/Morse_code_abbreviations

    Although a few abbreviations (such as SX for "dollar") are carried over from former commercial telegraph codes, almost all Morse abbreviations are not commercial codes. From 1845 until well into the second half of the 20th century, commercial telegraphic code books were used to shorten telegrams, e.g. PASCOELA = "Locals have plundered everything from the wreck."

  5. Radio spectrum - Wikipedia

    en.wikipedia.org/wiki/Radio_spectrum

    The radio spectrum is the part of the electromagnetic spectrum with frequencies from 3 ... Abbreviation ITU band number ... Standard Letter Designations for Radar ...

  6. List of aviation, avionics, aerospace and aeronautical ...

    en.wikipedia.org/wiki/List_of_aviation,_avionics...

    Abbreviation Term Notes M medium Wake turbulence category: MAC mean aerodynamic chord: MAC mid-air collision: MAHF Missed Approach Holding Fix Used in RNAV MANAB Manual of Word Abbreviations [15] Used in Canada MAP manifold absolute pressure: MAP missed approach point Or: MAPt. Instrument approach. MAPS Minimum Aviation Performance Standards MATS

  7. List of ISO 3166 country codes - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_3166_country_codes

    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.

  8. Allied military phonetic spelling alphabets - Wikipedia

    en.wikipedia.org/wiki/Allied_military_phonetic...

    The Allied military phonetic spelling alphabets prescribed the words that are used to represent each letter of the alphabet, when spelling other words out loud, letter-by-letter, and how the spelling words should be pronounced for use by the Allies of World War II.

  9. Wikipedia:Manual of Style/Abbreviations - Wikipedia

    en.wikipedia.org/.../Abbreviations

    A shortening is an abbreviation formed by removing at least the last letter of a word (e.g. etc. and rhino), and sometimes also containing letters not present in the full form (e.g. bike). As a general rule, use a full point after a shortening that only exists in writing (e.g. etc. ) but not for a shortening that is used in speech (e.g. rhino ).