A radio communication abbreviation meaning 'message received and understood,' derived from the word 'roger.'
From aviation and military radio protocol, where letters of the phonetic alphabet were used to avoid confusion. 'Roger' was the phonetic letter for 'R,' standing for 'received.' It became standard in 1920s aviation.
Pilots and soldiers still say 'Roger' instead of just 'yes' because radio static can garble sound—using the full word 'Roger' is much harder to mishear than a simple 'ok,' making it a safety feature baked into language.
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