Acronyms are new words formed from the initial letters of a set of other words. These can be forms such as CD (“compact disk”) or VCR (“video cassette recorder”) where the pronunciation consists of saying each separate letter. More typically, acronyms are pronounced as new single words, as in NATO, NASA or UNESCO. These examples have kept their capital letters, but many acronyms simply become everyday terms such as laser (“light amplification by stimulated emission of radiation”), radar (“radio detecting and ranging”), scuba (“self-contained underwater breathing apparatus”) and zip (“zone improvement plan”) code. You might even hear talk of a snafu, which is reputed to have its origins in “situation normal, all fouled up,”.

Names for organizations are often designed to have their acronym represent an appropriate term, as in “mothers against drunk driving” (MADD) and “women against rape” (WAR). Some new acronyms come into general use so quickly that many speakers do not think of their component meanings. Innovations such as the ATM (“automatic teller machine”) and the required PIN (“personal identification number”) are regularly used with one of their elements repeated, as in I sometimes forget my PIN number when I go to the ATM machine.