Abbreviation - Wikipedia
https://en.wikipedia.org/wiki/AbbreviationAn abbreviation (from Latin brevis, meaning short) is a shortened form of a word or phrase, by any method.It may consist of a group of letters or words taken from the full version of the word or phrase; for example, the word abbreviation can itself be represented by the abbreviation abbr., abbrv., or abbrev.; NPO, for nil (or nothing) per (by) os (mouth) is an abbreviated medical …