Vayu-Vata
Vāyu-Vāta or Vāta-Vāyu (IPA: ʋɑːyu-ʋɑːt̪ə) is the Avestan language name of a dual-natured Zoroastrian divinity of the wind (Vayu) and of the atmosphere (Vata). The names are also used independently of one another, with 'Vayu' occurring more frequently than 'Vata', but even when used independently still representing the other aspect. The entity is simultaneously angelic and demonic, that is, depending on the circumstances, either yazata - "worthy of worship" - or daeva, which in Zoroastrian tradition is a demon. Scripture frequently applies the epithet "good" when speaking of one or the other in a positive context. In Zurvanism (Zurvanite Zoroastrianism, a now-extinct form of Zoroastrianism), Vata-Vayu represented two facets of the quaternary Zurvan.