A number may refer to any of the following:
1. Sometimes abbreviated as num, a number is any character that is 1, 2, 3, 4, 5, 6, 7, 8, 9, or 0. Any negative number is any of the earlier characters beginning with a hyphen, for example, -12 is a negative number. Numbers have many relationships with computers. Examples include measuring the clock speed of a CPU, or the binary numbers that send the CPU instructions. Numbers may be input via a numeric keypad, or through those keys located above the letters on a keyboard.
2. The term number also referres to an ordered list or number list. See our numbering definition for information about creating this type of list.
3. A number is an abbreviation often used for "phone number."
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