What is a signal indicating an emergency that requires immediate action?

An alarm signal is a clear and direct indicator of an emergency that necessitates immediate action. This signal is typically designed to alert occupants of a building to the presence of a fire, gas leak, or other hazardous conditions. The primary purpose of an alarm signal is to prompt a swift response, such as evacuation or other emergency procedures, to ensure the safety of everyone involved.

In contrast, options like the alarm verification feature and alarm notification appliance refer to components of an alarm system that serve different functions. The alarm verification feature is meant to reduce false alarms by requiring validation of an alarm condition before an emergency response is initiated. The alarm notification appliance refers to devices, such as horns or strobes, that convey alarm signals visually or audibly but do not represent the signal itself. An annunciator serves as a monitoring panel that displays the locations of alarms and their status but does not produce the immediate emergency signal. Thus, while these terms are related to alarm systems, they do not represent the core concept of an emergency signal as effectively as the alarm signal does.