Diaconicon

The diaconicon (Greek:διακονικόν diakonikon; Slavonic: diakonik) is, in Eastern Orthodox and Eastern Catholic churches, the name given to a chamber on the south side of the central apse of the church, where the vestments, books, etc., that are used in the Divine Services of the church are kept (the sacred vessels are kept in the Prothesis, which is on the north side of the sanctuary).