Code 3

Code 3 is usually used to either describe a set of model cars and trucks that were customized by the person making the model, or a mode of response for emergency vehicles.

• Code 3 Collectibles, a scale model company.
• Code 3 Response, a response mode for emergency vehicles.
• Code 3 Public Safety Equipment, a manufacturer of emergency vehicle warning devices.
• Code-3 temporal pattern, a distinct evacuation tone pattern used primarially in fire alarms