Wikipedia
A barsom is a ritual implement used by Zoroastrian priests to solemnize certain sacred ceremonies.
The word barsom derives from the Avestan language baresman (trisyllabic, ), which is in turn a substantive of barez "to grow high." The later form – barsom – first appears in the 9th–12th-century texts of Zoroastrian tradition, but remains in use to the present day.
The baresman is not related to the baresnum, which is a purification ceremony. The baresman should also not be confused with the "mace", the varza (Avestan, MP gurz). The varza is a metal rod, about one centimer in thickness, often crowned with a bull's head.
It has been suggested that the baresman may have a Zagrosian origin.
Usage examples of "barsom".
Artaban, standing beside it, and waving a barsom of thin tamarisk branches above the fire, fed it with dry sticks of pine and fragrant oils.