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from Wiktionary, Creative Commons Attribution/Share-Alike License.

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