Within Hinduism a large number of personal gods (Ishvaras) are worshipped as murtis. These beings are significantly powerful entities known as devas. The exact nature of belief in regards to each deity varies between differing Hindu denominations and philosophies. Often these beings are depicted in humanoid or partially humanoid forms, complete with a set of unique and complex iconography in each case. The devas are expansions of Brahman into various forms, each with a certain quality. In the Rig Veda 33 devas are described, which are personifications of phenomena in nature.