Kinds of abbreviation in the contrasted language.
An abbreviation is a shortened form of a word or phrase, such as Jan. for January. The abbreviated form of the word abbreviation is abbr. — or, less commonly, abbrv. or abbrev.
In American English, many abbreviations are followed by a period (Dr., Ms.). In contrast, British usage generally favors omitting the period (or full stop) in abbreviations that include the first and last letters of a single word (Dr, Ms). When an abbreviation appears at the end of a sentence, a single period serves both to mark the abbreviation and to close the sentence.
