Jav, Prav and Nav
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Yav (Jav), Prav and Nav (Navi) are three worlds described in the Book of Veles. References to them became popular among Ukrainians and Russian neopagans. All three combine into Triglav that governs the Universe.
Yav is the material world in which we are right now. Gods however are equally part of Yav. Yav is contained within 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. This concept is similar to Dharma in Hinduism and Buddhism.
In the Russian language there are very similar words such as [nav]ernoe meaning probably (when something is uncertain), [jav]lenie or yavlenie meaning representation (a real depiction of something), [prav]lenie or [prav]o meaning rule or right. YAV is not having any concrete meaning in Rigveda.
The word "yav"/"jav" may be related to Polish jawa, meaning the reality (not a dream, e.g. jawa lub sen - reality or a dream).