Irk Bitig (Old Turkic: π°π°Ίπ°΄ π°π°π± π°π°ββ), known as the Book of Omens or Book of Divination in English, is a 9th-century manuscript book on divination that was discovered in the "Library Cave" of the Mogao Caves in Dunhuang, China, by Aurel Stein in 1907, and is now in the collection of the British Library in London, England.