Flag: N. A Variable Or Quantity That Can Take On One Of Two Value

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:flag: n. A variable or quantity that can take on one of two
values; a bit, particularly one that is used to indicate one of two
outcomes or is used to control which of two things is to be done.
"This flag controls whether to clear the screen before printing
the message." "The program status word contains several flag
bits." Used of humans analogously to {bit}. See also
{hidden flag}, {mode bit}.
-- The AI Hackers Dictionary