What type of alarms are known as "panic buttons" activated by pressing a hidden button?

Duress alarms are specifically designed as "panic buttons" that can be discreetly activated in situations where an individual feels threatened or in danger. When someone presses this hidden button, it sends an immediate alert to security personnel or law enforcement without drawing attention to the user. This type of alarm is crucial in environments where individuals may face coercion, such as retail stores, banking institutions, or personal safety situations.

The other options do not fit this description. Fire alarms are intended to warn of fire hazards, burglar alarms focus on unauthorized intrusions, and vault alarms are specifically designed to protect secure storage areas but do not typically involve hidden activation by individuals in distress.