Altar lamp
An altar lamp, or sanctuary lamp, is the flame kept near the altar in a church or synagogue. The flame is always kept alive, so is commonly called an "eternal flame". It represents that God is always there with the people.
Altar Lamp Media
Altar lamp at St Pancras Church, Ipswich, representing a chained rather than a fixed style
A chancel lamp hangs above the altar of St. Matthew's German Evangelical Lutheran Church