Jav, Prav and Nav
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Yav (Jav), Prav and Nav are three worlds described in the Book of Veles. References to them became popular among Russian neopagans.
Yav is the material world in which we are right now. Gods however are equally part of Yav. Yav is contained within Nav.
Nav is the immaterial world, the world of the dead. Stars, which are the souls of the dead, as well as Svarga and Irij, are parts of Nav.
Prav is the law of Svarog that governs both Yav and Nav. Modern parallels to this concept are laws of physics, but there is one big difference. The law that says that a stone falls when dropped is not only a mere observable fact: it is rightful, good and just that stones fall to the ground when dropped. A somewhat similar belief today is anthropic principle, but it only states that laws of physics are useful.
In most some Slavic languages, "pravo" or "prawo" means "law", "rule", one's right to something, and the right side.
