Tengri (騰格里; Kök Teŋri/Teŋiri; Old Uyghur: tängri; Middle Turkic: تآنغرِ; تڭری; Теңир; Тәңір; Tanrı; Tanrı; Тангра; Proto-Turkic *teŋri / *taŋrɨ; Mongolian script: , T'ngri; Modern Mongolian: Тэнгэр, Tenger; Uyghur: تەڭرى tengri ) is the all-encompassing God of Heaven in the traditional Turkic, Yeniseian, Mongolic and various other nomadic Altaic religious beliefs. Tengri is not considered a deity in the usual sense, but a personification of the universe. However, some qualities associated with Tengri as the judge and source of life, and being eternal and supreme, led European and Muslim writers to identify Tengri as a deity of Turkic and Mongolian people. According to Mongolian belief, Tengri's will (jayayan) may break its own usual laws and intervene by sending a chosen person to earth. It is also one of the terms used for the primary chief deity of the early Turkic and Mongolic peoples. Worship surrounding Tengri is called Tengrism. The core beings in Tengrism are the Sky Father (Tenger Etseg) and the Earth Mother (Umay Ana). It involves shamanism, animism, totemism and ancestor worship. The oldest form of the name is recorded in Chinese annals from the 4th century BC, describing the beliefs of the Xiongnu. It takes the form 撑犁/Cheng-li, which is hypothesized to be a Chinese transcription of Tängri. (The Proto-Turkic form of the word has been reconstructed as *Teŋri or *Taŋrɨ.) Alternatively, a reconstructed Altaic etymology from *T`aŋgiri ("oath" or "god") would emphasize the god's divinity rather than his domain over the sky. It is generally assumed the term tengri originally meant "sky". Andrey Kononov suggested that the term is formed by the words tän (morning) and injir (evening) into tänri, referring to the sky as whole. The Turkic form, Tengri, is attested in the 8th century Orkhon inscriptions as the Old Turkic form Teŋri. In modern Turkish, the derived word "Tanrı" is used as the generic word for "god", or for the Abrahamic God, and is used today by Turkish people to refer to any god.