what is the ner tamid used for in a synagogue
In Judaism, the sanctuary lamp is known by its Hebrew name, ner tamid (Hebrew: נֵר תָּמִיד ‬), which is usually translated as "eternal flame" or "eternal light". Hanging or standing in front of the ark in every Jewish synagogue, it is meant to represent the menorah of the Temple in Jerusalem as well as the continuously burning fire on the altar of burnt offerings in front of the Temple. It also symbolizes God's eternal presence and is therefore never extinguished. It is also intended to draw parallels between God and fire, or light, which is emphasized throughout the book of Exodus in the Torah.