Logic NOR Gate

A NOR gate is also referred to as a NEGATED OR gate. It is the opposite or inverse of a simple OR gate. With the OR gate the output was forced to logic LOW (0) when both inputs were forced to logic LOW (0) and the output was logic HIGH (1) in all other situations, but with a NOR gate the output is forced to logic HIGH (1) when both inputs are forced to logic LOW (0) and the output is forced to logic LOW (0) in all other situations. The symbol and truth table for an NOR gate can be seen here.