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Wiktionary

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