ARTICLE 530 Motion Picture and Television Studios and Similar Locations
530.2
Bull Switch.
An externally operated wall-mounted safety switch that may or may not contain overcurrent protection and is designed for the connection of portable cables and cords.
the term "disconnect switch" is used in 527, 550, and 620
I believe the correct term should be as defined in Article 100:
Disconnecting Means. A device, or group of devices, or other means by which the conductors of a circuit can be disconnected from their source of supply.
