What is the name of the highest grade of Zoroastrian fire?

Atash Behram is the highest grade of sacred fire in a Zoroastrian fire temple. The name is commonly translated as “Fire of Victory,” and an Atash Behram is maintained as an eternal flame and focus of worship.

Its consecration is exceptionally elaborate. Traditionally, 16 different kinds of fire are collected, including fires associated with crafts, households, and lightning. Each fire undergoes purification before the fires are ritually combined. The full process can require a large priestly team and may take up to a year.

Zoroastrian tradition recognizes three principal grades of temple fire. Atash Behram is the highest, followed by Atash Adaran and then Atash Dadgah. A common mistake is treating these names as interchangeable temple titles: they identify different grades of consecrated fire. The Iranshah Atash Behram at Udvada is especially famous; its fire is traditionally traced to 721 CE and has been burning in Udvada since 1741.