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Computing (FOLDOC) dictionary (also found in English - Vietnamese, )
NOR
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Not OR.
The Boolean function which is true if none of its inputs are
true and false otherwise, the logical complement of
inclusive OR. The binary (two-input) NOR function can be
defined (written as an infix operator):
A NOR B = NOT (A OR B) = (NOT A) AND (NOT B)
Its truth table is:
A | B | A NOR B
--+---+---------
F | F | T
F | T | F
T | F | F
T | T | F
NOR, like NAND, forms a complete set of Boolean functions on
its own since it can be used to make NOT, AND, OR and any
other Boolean function: