Burz is the middle Persian

Middle Persian

Middle Persian , indigenously known as "Pârsig" sometimes referred to as Pahlavi or Pehlevi, is the Middle Iranian language/ethnolect of Southwestern Iran that during Sassanid times became a prestige dialect and so came to be spoken in other regions as well. Middle Persian is classified as a...

 name for the Indo-Iranian divinity of waters. Burz is also known as Ahura Berezant in the texts of the Avesta

Avesta

The Avesta is the primary collection of sacred texts of Zoroastrianism, composed in the Avestan language.-Early transmission:The texts of the Avesta — which are all in the Avestan language — were composed over the course of several hundred years. The most important portion, the Gathas,...

, and also as Apam Napat

Apam Napat

Apam Napat is an eminent figure of the Indo-Iranian pantheon. In Hinduism, Apām Napāt is the god of fresh water, such as in rivers and lakes...

in Avestan and Vedic Sanskrit

Sanskrit

Sanskrit , is a historical Indo-Aryan language and the primary liturgical language of Hinduism, Jainism and Buddhism.Buddhism: besides Pali, see Buddhist Hybrid Sanskrit Today, it is listed as one of the 22 scheduled languages of India and is an official language of the state of Uttarakhand...

. Burz is a Yazad (Avestan: Yazata

Yazata

Yazata is the Avestan language word for a Zoroastrian concept. The word has a wide range of meanings but generally signifies a divinity...

) in Zoroastrianism

Zoroastrianism

Zoroastrianism is a religion and philosophy based on the teachings of prophet Zoroaster and was formerly among the world's largest religions. It was probably founded some time before the 6th century BCE in Greater Iran.In Zoroastrianism, the Creator Ahura Mazda is all good, and no evil...

 and later Persian mythology

Persian mythology

Persian mythology are traditional tales and stories of ancient origin, some involving extraordinary or supernatural beings. Drawn from the legendary past of the Iranian cultural continent which especially consists of the state of Iran, Afghanistan, Tajikistan and Central Asia, they reflect the...

.

Mary Boyce

Mary Boyce

Nora Elisabeth Mary Boyce was a British scholar of Iranian languages, and an authority on Zoroastrianism...

 suggests that the proto-Iranian Apam Napat incorporated many of the features of a proto-Indo-Iranian equivalent of *vouruna

Varuna

In Vedic religion, Varuna is a god of the sky, of water and of the celestial ocean, as well as a god of law and of the underworld...

, who in turn may be the Vouru-kaša (luminous ocean) of Persian mythology.

In Persian mythology, Apam Napat has also some military aspects and is said to keep rebellion in check.

In fiction

• Tolkien used the word búrz to mean "dark" in one of his invented languages (the Black Speech
  Black Speech
  The Black Speech is a fictional language created by J. R. R. Tolkien.One of the languages of Arda in Tolkien's Middle-earth legendarium, it was spoken in the realm of Mordor...
  
  ).