In computers, a logic circuit that is a negative OR gate. It is an OR gate with an Inverter on it's output.
a N OT- OR circuit which is an OR gate followed by a NOT gate
A logic gate whose output is logical 1 (true) only when all its inputs are logical 0 (false) and is logical 1 otherwise. It is a universal gate, since any logical or Boolean function can be realized with circuits consisting only of NOR gates.
Gate whose output is 0 if any of its inputs is a 1.