Encyclopedia
Tsar's Gates
Royal Gates - a two-leaf especially ornate door in the central part of the iconostasis, located opposite the altar, through which during the Liturgy the Holy Gifts are carried out for communion
Source: "SP 31-103-99. Buildings, Structures and Complexes of Orthodox Churches"
(adopted by the Decree of the Russian State Construction Committee on December 27, 1999 No. 92)