What term describes a signal initiated by a fire alarm device, such as a smoke detector or pull station?

The term that accurately describes a signal initiated by a fire alarm device, such as a smoke detector or pull station, is "fire alarm signal." This term encompasses the various signals communicated by the fire alarm system when it detects smoke, heat, or other indicators of a potential fire. The fire alarm signal triggers not only the audible alarms but can also activate visual alarms and initiate communication with the fire department, ensuring a prompt response to the situation.

The other terms do not precisely describe the function of the signals emitted by fire alarm devices. "Fire alert" and "fire warning" might convey a similar concept, but they lack the specific implication of an alarm system's response to a detected condition, thus not capturing the full scope of the system's function. "Emergency signal," while related, can apply to a broader range of emergencies and does not exclusively pertain to fire situations. Hence, the specificity of "fire alarm signal" makes it the correct term for this context.