A symbol or annotation. • A mark or token by which a thing may be known; a visible sign; a character; a distinctive mark or feature; a characteristic quality. • A mark, or sign, made to call attention, to point out something to notice, or the like; a sign, or token, proving or giving evidence. • A brief remark; a marginal comment or explanation; hence, an annotation on a text or author; a comment; a critical, explanatory, or illustrative observation. • A written or printed communication or commitment. • A brief piece of writing intended to assist the memory; a memorandum; a minute. • A short informal letter; a billet. • An academic treatise (often without regard to length); a treatment; a discussion paper; (loosely) any contribution to an academic discourse. • A diplomatic missive or written communication. • A written or printed paper (or digital equivalent) acknowledging a debt, and promising payment. • A list of items or of charges; an account. • A piece of paper or polymer money; a banknote. • A small size of paper used for writing letters or notes. • A sound. • A character, variously formed, to indicate the length of a tone, and variously placed upon the staff to indicate its pitch. • A musical sound; a tone; an utterance; a tune; a beat of a drum. • A key of the piano or organ. • A call or song of a bird. • An indicator to which the player must correctly time some input. • An element of a scent, fragrance, or perfume, especially as a descriptor or category. • Observation; notice; heed. • Reputation; distinction. • A critical comment. • Notification; information; intelligence. • Mark of disgrace.