(*plural* vertical bars)

- (computing) The ASCII character at the decimal position of 124, depicted as | or Â¦;
- (mathematics) represents an absolute value (e.g. )
- (mathematics) norms (e.g.)
- (mathematics) set definitions (e.g.)
- (mathematics) conditional probability (e.g.)
- (mathematics) divisibility (e.g.)
- (computing) a symbol which, in Unix, is used as a pipe
- (computing) a symbol which, in regular expressions, indicates an alternation