Parapegm

Parapegm Par"a*pegm, n. [L. parapegma, Gr. ?, fr. ? to fix beside; para` beside + ? to fix: cf. F. parapegme.] An engraved tablet, usually of brass, set up in a public place. [1913 Webster]

Note: Parapegms were used for the publication of laws, proclamations, etc., and the recording of astronomical phenomena or calendar events. [1913 Webster]