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: NOT A = A NOR A A OR B = NOT (A NOR B) A AND B = (NOT A) NOR (NOT B) |