B-bar (Morse code)
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The B-bar was a Morse code sequence that was used by German military submarines (U-boats) during World War II at the beginning of all their radio transmissions. It was a bar, followed by three dots, then another bar (▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄). It was the Morse code for the letter B but with an extra bar at the end, hence the name "B-bar". The name was coined by the British.[1] Bars in Morse code are more conventionally called "dashes" these days.
References
- ↑ The Battle of the Atlantic and Signals Intelligence: U–Boat Situations and Trends, 1941–1945 by David Syrett, p. 33
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