The abbreviation is (Italian abbreviatura from Latin brevis - short): 1. A word formed from the names of initial letters or from the initial sounds of words included in the original phrase (initial abbreviation). Letter abbreviation. An abbreviation made up of the alphabetic names of the initial letters of the words that form the original phrase. RSFSR (er-es-ef-es-er) (Russian Soviet Federative Socialist Republic). The abbreviation is letter-z in u k about in a i (mixed). An abbreviation formed partly from the names of the initial letters, partly from the initial sounds of the words of the original phrase. CDSA (tse-de-sa) (Central House of the Soviet Army). Sound abbreviation. An abbreviation formed from the initial sounds of the words of the original phrase. University (higher educational institution). TASS (Telegraph Agency of the Soviet Union). On the grammatical gender of indeclinable initial abbreviations See gender.