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but no two ships bore the same code letters at the same time. With the introduction of radio for communications, code letters were used also as radio call signs.

Flags used

Code letters used the twenty-six flags that represent the letters of the alphabet, plus the ten flags that represent the digits 0-9 also have been used. The substitute flags have not been used for call signs.

Each flag represents a character. If the ship's call sign is "3EJH2" (Panama Flag) the seamen would not say "Three E J H Two". Instead,

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