HTML <abbr> Tag
An abbreviation is marked up as follows:
Definition and Usage
The <abbr> tag defines an abbreviation or an acronym, like "Mr.", "Dec.", "ASAP", "ATM".
Tip: An abbreviation and an acronym are both shortened versions of something else. Both is often represented as a series of letters.
Marking up abbreviations can give useful information to browsers, translation systems and search-engines.