signallers

Those transmitting messages

Signallers are people who send signals, particularly in military contexts where they operate communication equipment or transmit messages between units.

In British railway terminology, signallers control the signals and switches that direct train traffic.

The spelling with double-l is British; Americans write *signalers*.

The signallers maintained radio contact with headquarters throughout the operation.

signals

flags

Symbolic national cloths

beaconsLights that guide travelers
flaresPyrotechnic distress signals
sirensEmergency vehicle noisemakers

horns · bells · alarms · flash · blink · indicator · warning · distress · smoke · lanterns

military

radio

Electromagnetic wave receiver

flaresPyrotechnic distress signals
telegraphyElectrical long-distance messaging
cipherHidden writing system

encryption · decryption · reconnaissance · scrambler · jamming · radar · sonar · heliograph · dispatch · battalion

transport

flagmen

Workers directing traffic

crossingPoint where paths intersect
railwayTrack system for trains
trafficMovement along routes

pointsmen · guards · conductors · linemen · trackside · platform · switchmen · brakemen · yardmasters · dispatchers

communication

transmitters

Devices that send signals

broadcastersThose who transmit programming
announcersThose who narrate events
operatorsThose who manage equipment

telegraphers · radiomen · messengers · relayers · dispatchers · encoders · interpreters · receivers · senders · correspondents

biology

neurons

Signal-transmitting brain cells

cellsBasic biological units
receptorsProteins binding specific molecules
hormonesBloodstream signaling molecules

molecules · enzymes · pathways · synapses · transmitters · proteins · chemical · electrical · nerve · pheromones

signallers

flags

radio

flagmen

transmitters

neurons

signallers

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