[very common] 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}.
[glossary]
[Reference(s) to this entry by made by: {bit}{bit bashing}{flag day}{mode bit}{overflow bit}{trit}]