NOR gates are not a brand but a fundamental logic gate in digital electronics, used in various industries for circuit design. They are produced by multiple companies worldwide, including Texas Instruments (USA), NXP Semiconductors (Netherlands), and Toshiba (Japan). These gates are essential components in computing, telecommunications, and industrial automation, performing logical operations to enable complex electronic systems. Manufacturers like Texas Instruments offer NOR gates as part of their semiconductor product lines, catering to sectors such as automotive, consumer electronics, and aerospace.