The most prominent feature of an Orthodox church is the Iconostasis, consisting of one or more rows of Icons and broken by a set of doors in the center (the Holy or Royal Doors) and a door at each side (the Deacon's Doors).
A typical Iconostasis consists of one or more tiers (rows) of Icons. At the center of the first, or lowest, tier, are the Royal Doors, on which are placed Icons of the four Evangelists who announced to the world Good News.
At either side of the Royal Doors are always placed an Icon of the Savior (to the right) and of the Most Holy Theotokos (to the left). On either side of the Royal Doors, beyond the Icons of the Lord and His Mother, are two doors—Deacon’s Doors. (These doors either have icons of an Archangel of Saint Stephen the First Martyr and Deacon)
Ascending above the Local Icons (Saint John the Forerunner, the temple's patron saint and/or Saint Nicholas of Myra, among others) are three more tiers of Icons. Immediately above the Icon of the Mystical Supper is placed an Icon of the Savior in royal garments, flanked by His Mother and John the Forerunner and an array of other saints, including the Archangels Michael and Gabriel, the Apostles Peter and Paul and bishop saints and martyrs. This tier is called the Deisis (prayer), since all in this tier are turned to Christ in supplication. The tier immediately above are Icons of the principal Feasts of the Lord and the Theotokos.
The top row contains the Old Testament Prophets, --in the midst of which is the Birthgiver of God with the Divine Infant Who is from everlasting and Who was their hope, their consolation, and the subject of their prophecies.
At the very top of the Iconostasis is placed the Holy Cross, upon which the Lord was crucified, effecting thereby our salvation.