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Warning system

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Warning light indicating danger of laser exposure.

A warning system is any system of biological or technical nature deployed by an individual or group to inform of a future danger. Its purpose is to enable the deployer of the warning system to prepare for the danger and act accordingly to mitigate against or avoid it.

Biological warning systems

Man-made warning systems

Civilian warning systems

A Fire alarm that warns people if a building is on fire.

Military warning systems

[ http://earlywarningsys.com