The Free On-line Dictionary of Computing (30 December 2018):

NAND

    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 |    F

   NAND, 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 A

   A AND B = NOT (A NAND B)

   A OR B = (NOT A) NAND (NOT B)

   (1995-01-24)