Wiki --> Bema: "The bema, or bima, is an elevated platform used as an orator's podium in ancient Athens. In Jewish synagogues, it is also known as a bimah and is for Torah reading during services."
The ceremonial use of a bema carried over from Judaism into early Christian church architecture. It was originally a raised platform with a lectern and seats for the clergy, from which lessons from the Scriptures were read and the sermon was delivered. In Western Christianity the bema developed over time into the chancel (or presbytery) and the pulpit."
A Bema in an Eastern Orthodox church, with three steps leading up to it. Assumption Cathedral in Smolensk, western Russia...