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Comprehensive
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dash the longer of the two basic signals in Morse code. [1/12 definitions]
dot a short click, tap, or buzz used in combination with longer dashes to represent letters in Morse code. [1/10 definitions]
SOS a call or signal for help, esp. by the use of the Morse code symbols for these letters, as from a ship in distress (considered by some to be an abbreviation for "save our ship" or "save our souls").