Ten-Four Day

October 4 is Ten-Four Day!

Ten-Four Day is a celebration of ham radio operators who signal an affirmative reply with “ten-four”. This signal can also mean “message received”, “understood”, “okay”, and “roger that”.

The code “ten-four” was created for CB radio and police radio systems to make radio exchanges come across clearer. See the full list of police codes here.

Sources: The Holiday Whiz, Every Day is Special

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