A handwritten letter from the British Prime Minister to the commanding officers of nuclear submarines, specifying the action to be taken in the event that an enemy nuclear strike destroys the British government.

plural of poison pen letter

plural of pre-approval letter

plural of letter of counter-mart

Alternative form of letter of countermarque

(law) Alternative spelling of black-letter law

plural of green-ink letter

(idiomatic) A list of abbreviations, separated by commas, representing the academic qualifications and civil or military honours achieved by a person