hashtagA function used with Twitter and other services that give a post or tweet a keyword. For example, someone could use the #computer hashtag to let others know it relates to computers and have it easily found and sorted. All hash tags begin with a hash character, which is the symbol (#) above the 3 on U.S. keyboards.

Tip: See our Octothorpe key page for full information on the key and its location on the keyboard.

Also see: Hash, Internet terms, Tag, Twitter