We've found 3 phrases for letters (0.131 seconds):

catch-as-catch-can »    A. 1681, John Fryer, Richard Chiswell, Robert Roberts, Robert White, A New Account of East-India and Persia, in Eight Letters, Being Nine Years Travels, Begun 1672 and Finished 1681.

letters after one's name »    A list of abbreviations, separated by commas, representing the academic qualifications and civil or military honours achieved by a person.

spell out »    From its component letters.

BTW, Why won't you become an editor?