Three letter acronym
A three letter acronym (commonly referred to as a TLA) is an abbreviation, an alphabetism, an initialism or an acronym consisting of three letters. Many of the abbreviations described as "three letter acronyms" are initialisms, which some definitions of acronym do not include (See acronym and initialism). Nevertheless, "Three letter acronym" is commonly used for any set of three letters used as an abbreviation.
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