A subdeacon is a clergyman in the Orthodox Church (greek, russian), usually assisting bishops during liturgical services.
In addition to hierarchical ministries, a subdeacon serves at the altar and is responsible for conducting the Divine Liturgy. Also, a subdeacon may read the Epistles in the liturgy. His duties also include decorating and maintaining the altar.
The ordination to the sub-deacons takes place outside the altar. The reader to be ordained as a subdeacon is introduced to the bishop by two other subdeacons. He must look toward the east and make one bow, after which, make three bows to the bishop. The subdeacons then give the oracle to the bishop, who puts it on the new subdeacon and thus ends the consecration ceremony.