Code letters were a method of identifying ships before the introduction of modern navigation aids. Later, with the introduction of radio, code letters were also used as radio callsigns.
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Famous quotes containing the words code and/or letters:
“Faultless honesty is a sine qua non of business life. Not alone the honesty according to the moral code and the Bible. When I speak of honesty I refer to the small, hidden, evasive meannesses of our natures. I speak of the honesty of ourselves to ourselves.”
—Alice Foote MacDougall (1867–1945)
“Bolkenstein, a Minister, was speaking on the Dutch programme from London, and he said that they ought to make a collection of diaries and letters after the war. Of course, they all made a rush at my diary immediately. Just imagine how interesting it would be if I were to publish a romance of the “Secret Annexe.” The title alone would be enough to make people think it was a detective story.”
—Anne Frank (1929–1945)