Short for numeric lock or number lock, the Num key, Num Lock, or Num Lk key is on the top-left corner of a keyboard’s numeric keypad. The Num Lock key enables and disables the numeric pad.
When Num Lock is enabled, you can use the numbers on the keypad. When Num Lock is disabled, pressing those keys activates those key’s alternate function. For instance, the arrow keys on the keypad may only be used if Num Lock is disabled. The picture shows what the Num Lock key with a LED (light) may look like on a keyboard.
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