signalman
Noun
Meaning
A man whose business is to manage or display signals; especially, one employed in setting the signals by which railroad trains are run or warned.
Source: Webster's dictionarySynonyms
signaller
sentry
guard
beacon
patrolman
detective
warden
flag
observer
patrol
policeman
lookout
picket
custodian
brakeman
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Examples
Other uses A U.S. Navy signalman sends Morse code signals in 2005.
The person who holds the flags is known as the signalman.
The signalman took the message, 'do you need help?'