Chronogram

n. [ Gr. &unr_; time + &unr_; writing, character: cf. F. chronogramme. ] 1. An inscription in which certain numeral letters, made to appear specially conspicuous, on being added together, express a particular date or epoch, as in the motto of a medal struck by Gustavus Adolphus in 1632: ChrIstVs DVX; ergo trIVMphVs. - the capitals of which give, when added as numerals, the sum 1632. [ 1913 Webster ]

2. The record or inscription made by a chronograph. [ 1913 Webster ]