Duress code
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In military and security communication, a duress code is a simple word or phrase used during normal conversation to alert other personnel that an authorized person is under duress. A duress code requires planning and rehearsal to ensure an appropriate response. This code is changed frequently to minimize compromise.
Some home and property alarm systems have duress codes. Often the last two digits of the reset code are switched around. Entering the code when under duress from an assailant often triggers a silent alarm, alerting police or security personnel in a covert manner.
The concept of the code is used in fiction, particularly in spy fiction: for example, in the fourth episode of the fifth season of 24, hostage and CTU agent Jack Bauer used the phrase "flank two" as a duress code.
