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

• Aposematism (e.g. warning coloration)
• Climate canary
• Fear
• Miner's canary
• Pain

Man-made warning systems

Civilian warning systems

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

• Alberta Emergency Public Warning System
• Automatic Warning System
• Emergency Alert System
• Famine Early Warning Systems Network
• Fire alarm system
• Gale warning
• Ground Proximity Warning System
• Indian Ocean Tsunami Warning System
• Intelligence warning system
• J-Alert
• Lane Departure Warning System
• May contain
• North Warning System
• Traffic Collision Avoidance System
• Train Protection & Warning System
• Tsunami warning system

Military warning systems

• Airborne Warning and Control System
• Ballistic Missile Early Warning System

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