For the World of Warcraft ex-NPC, see Captain Placeholder. Captain Placeholder was an NPC (non-playable character) in Blizzards MMORPG World of Warcraft. ...

A placeholder is a term, sign or some other thing which generally stands in the place of content which is unknown or not identified.

In disciplines involving formal languages, particularly mathematics and computer science, the placeholder concept is represented by free variables and bound variables, and on what was originally a more light-hearted level, metasyntactic variables. In mathematics, logic and computer science, a formal language is a set of finite-length words (i. ... Wikibooks Wikiversity has more about this subject: School of Mathematics Wikiquote has a collection of quotations by or about: Mathematics Look up Mathematics on Wiktionary, the free dictionary Wikimedia Commons has more media related to: Mathematics Bogomolny, Alexander: Interactive Mathematics Miscellany and Puzzles. ... Wikibooks Wikiversity has more about this subject: School of Computer Science Open Directory Project: Computer Science Collection of Computer Science Bibliographies Belief that title science in computer science is inappropriate Categories: Computer science ... In mathematics, and in other disciplines involving formal languages, including mathematical logic and computer science, a free variable is a notation for a place or places in an expression, into which some definite substitution may take place, or with respect to which some operation (summation or quantification, to give two... A metasyntactic variable is a placeholder name, or a kind of alias term, commonly used to denote the subject matter under discussion, or a random member of a class of things under discussion. ...

In politics, a placeholder is sometimes used to indicate that a person is acting in a position on a non-permanent basis or as a proxy. The Elections and Parties Series Democracy Representative democracy History of democracy Referenda Liberal democracy Representation Voting Voting systems Ideology Elections Elections by country Elections by calender Electoral systems Politics Politics by country Political campaigns Political science Political philosophy Related topics Political parties Parties by country Parties by name Parties by... In law, when someone is said to be acting in a position it can mean one of three things. ... The word proxy can mean more than one thing: a person authorized to act for another person, or upon request by another person (see eg. ...

See also

• placeholder name
• trope