A logic gate whose output is logical 1 (true) only when all its inputs are logical 0 (false); the output is logical 0 otherwise. It is a universal gate, since any logical or Boolean function can be realized with circuits consisting only of NOR gates.
Articles on KurzweilAI.net that refer to NOR GateThe Age of Intelligent Machines, Chapter Four: The Formula for Intelligence By Ray Kurzweil
The Age of Intelligent Machines: A NOR B--The Basis of Intelligence? By Ray Kurzweil
Reflections on Stephen Wolfram's 'A New Kind of Science' By Ray Kurzweil