DIPTYCHON

This Greek word was applied in antiquity to a pair of writing tablets fastened together by rings, so that the inner sides, covered with wax, lay one upon the other. They were fastened sometimes by a strap, on the side opposite to the rings: sometimes by a string passed through two holes in the middle, and secured, if necessary, by seals at the back. (See the engravings under WRITING MATERIALS.) Two or more of the tablets (Triptycha, Polyptycha) were sometimes joined in the same way. They were used for notes, letters, and documents. Under the Empire much fancy and expense were lavished on them, the outer side being sometimes made of gold, silver, or magnificently carved ivory. This was especially the case after it became the fashion for consuls, and other high officials, to give presents of diptycha when entering upon office. For the diplomas made out on bronze diptycha for soldiers who had served their time, see MISSIO.