signal lamps
Flashing message devices
Signal lamps are lights used to communicate messages, typically through flashing patterns or colored beams.
Naval vessels use signal lamps to transmit Morse code between ships.
Railroad signal lamps indicate track conditions to approaching trains.
On vehicles, signal lamps include turn indicators and brake lights—any lamp that conveys information rather than simply illuminating.
- semaphoreFlag-based signaling system
- heliographSunlight-based signaling device
- Morse codeDot-dash signaling system
- lighthouseCoastal beacon tower
- beaconGuiding light source
runway lights · flare gun · searchlight · oil lantern · ship-to-shore · flashlight · incandescent bulb · strobe light · lantern · railway · railroad crossing · red · blinker · all clear · tower · trackside · navigation · running lights
- signalingsmoke signals, flag signals, semaphore, heliograph, Morse code
- military communicationsradio, walkie-talkie, radio operators, morse code, encrypted message
- rail safetytrain stop, crossing arms, safety gates, railroad crossing, train control
- railroadianarailroad spikes, railroad maps, rail passes, waybills, ticket stubs
- signalssignals, sign, waved, nodded, gestured
signal lampslighting fixtures
Devices that hold bulbs
streetlights · floodlights · headlamps · ambient lighting · lanterns