Not AND.The Boolean function which is true unless both its arguments are true, the logical complement of AND:A NAND B = NOT (A AND B) = (NOT A) OR (NOT B)Its truth table is:A | B | A NAND B --+---+--------- F | F |T F | T | T T | F |T T | T |FNAND, like NOR, 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 NAND AA AND B = NOT (A NAND B)A OR B = (NOT A) NAND (NOT B)(1995-01-24)