Acronym

An acronym is an abbreviation, often composed of the initial letters of the words in a short phrase, that is treated as word (often, a piece of jargon or the proper name of an organization). For example, SAM for [surface-to-air missile]? and NATO for the North Atlantic Treaty Organization. In its original meaning, acronyms were restricted to pronouncible abbreviations (what might be called true acronyms), though common usage permits calling unpronouncable abbreviations "acronyms" as well. Non-pronouncible abbreviations formed from initials (such as IBM for International Business Machines) are sometimes called initialisms.

Often, an acronym will come into such wide use that people think of it as a word in itself, and forget that it started out as an acronym. Examples include QUASAR (quasi-stellar radio source), LASER (light amplification through stimulation of electromagnetic radiation, IIRC :-) ) and RADAR (radio detection and ranging).

List of acronyms
List of medical acronyms

There are lots of acronyms to be found at http://www.acronymfinder.com/

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