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Why is the output of stateful elements often named Q?

A register has D (data) as input and Q as output.
What does the Q stand for? I'm having a hard time searching for it.


marked as duplicate by Chris Stratton, placeholder, Dave Tweed, Brian Carlton, Nick Alexeev Feb 5 '13 at 23:55

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Q represents the output of a flip-flop or register. For an edge-triggerred flip-flop, the clock-to-Q time is the time it takes for the register output to be in a stable state after a clock edge occurs.


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