plural of letter of comfort

(printing) Two letters on one shank; a ligature. / An item of mail requiring double postage.

A letter conveyed by a ship other than a mail packet.

Section of a periodical in which readers' letters are published.

plural of letter column

(dated, fandom slang) Correspondence, usually a letter, sent to a periodical commenting on either the contents of a previous issue or an earlier letter of comment.

A letter addressed to one person, or more, but published (as for example in a newspaper) for the public to read.

(finance) A letter that is not legally binding but provides some form of assurance about the financial position of an entity.

(rare) The letter R, which was trilled in Latin, imitating the sound of a snarling dog.

(singular only) The strict interpretation of the law or rules.