Num lock
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Num Lock is a key on the numeric keypad of most keyboards, used to switch that pad between number entry and arrow keys. It is a toggle key, like Caps Lock and Scroll Lock. Its state is usually represented by a light on the keyboard.
The Num Lock key exists because earlier 84-key IBM PC keyboards did not have arrows separate from the numeric keypad. Num Lock would be used to choose between the two functions.
When a computer's operating system crashes or hangs the Num Lock key is usually the only key that responds to being pressed.