What term describes a circuit that specifically energizes signaling equipment?

The term that describes a circuit specifically designed to energize signaling equipment is "Signal Circuit." Signal circuits are dedicated to transmitting information or alerts through various forms of signaling devices, such as lights, bells, or alarms. These circuits are integral to systems where communication of status or alerts is critical, such as in fire alarm systems, security systems, or notification devices.

By focusing on the function of these circuits, it is clear that their primary purpose is to convey signals rather than perform control or general power distribution functions found in other types of circuits. Therefore, when discussing circuits that energize signaling equipment, referring to them as signal circuits accurately captures their intended role within electrical systems.