In Morse code, the longer signal or dash (compared to 'dit,' the shorter dot); also used as an exclamation.
Onomatopoeia representing the sound of a longer Morse code signal. Contrasts with 'dit' for the shorter sound, creating the basis of telegraph and radio communication.
The most famous 'dah' sequence in history is S.O.S. (three dits, three dahs, three dits), and it doesn't actually stand for 'Save Our Souls'—it was just picked because it's distinctive in Morse code!
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