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number sign, hash mark, pound sign

In UNIX and HTML programming, the number sign (#) is called a hash mark.

  • The hash mark (#) is very useful in creating web pages.

Telephone companies often call the number sign a pound sign, although this usage can lead to confusion, since the term pound sign is also used for the British pound symbol (£).

  • On North American telephones, the pound sign (#) is found in the lower right-hand corner of the keypad.
  • Please call this mark (#) a number sign!