signaller
Word family (noun) sign signal signatory signature signing signaller (adjective) signed ≠ unsigned (verb) sign signal (adverb) signally
From Longman Dictionary of Contemporary Englishsignallersig‧nal‧ler /ˈsɪɡnələ $ -ər/ noun [countable] British English a signalman(2)Examples from the Corpussignaller• In one case a signaller worked 30 consecutive days.• Being explicit about internal state is an obvious advantage to the signaller as well as to the receiver.