05-08-17, 09:16 AM
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Member
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Join Date: Feb 2008
Posts: 6,329
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It is for sending messages, has been so for hundreds of years (hundreds? maybe a bit less), well before wireless, email or mobile phones. It is a bit like Morse, just with flags instead of a buzzer.
Read all about it:
https://en.wikipedia.org/wiki/Semaphore_line
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