D. or d. may refer to, usually as an abbreviation: * Don (honorific), a form of address in Spain, Portugal, Italy, and their former overseas empires, usually given to nobles or other individuals of high social rank. * Date of

death Death is the irreversible cessation of all biological functions that sustain an organism. For organisms with a brain, death can also be defined as the irreversible cessation of functioning of the whole brain, including brainstem, and brain ...

, as an abbreviation. * District of Columbia Department of Transportation, whose logo is "d." * '' Schubert Thematic Catalogue'', also known as the Deutsch catalogue (or D.), a numbered list of all compositions by Franz Schubert compiled by Otto Erich Deutsch. * a

penny A penny is a coin ( pennies) or a unit of currency (pl. pence) in various countries. Borrowed from the Carolingian denarius (hence its former abbreviation d.), it is usually the smallest denomination within a currency system. Presently, it is t ...

, from the Latin ''denarius''.

See also