The venu (Sanskrit: वेणु; /मुरळि; muraļi) is one of the ancient transverse flutes of Indian classical music. It is an aerophone typically made from bamboo, that is a side blown wind instrument. It continues to be in use in the South Indian Carnatic music tradition. It is referred to as nadi and tunava in the Rigveda and other Vedic texts of Hinduism. In northern Indian music, a similar flute is called bansuri. In the south, it is also called by various other names such as pullanguḻal (புல்லாங்குழல்) in Tamil (Tamil Nadu), oodakuḻal (ഓടകുഴൽ) or kurungu kuḻal (കുറുന് കുഴൽ) in Malayalam (Kerala) and ಕೊಳಲು (koḷalu) or ಮುರಳಿ (muraļi) in Kannada (Karnataka) . It is known as pillana grōvi (పిల్లన గ్రోవి) or vēṇuvu (వేణువు) in Telugu (Andhra Pradesh & Telangana). It is also called as Carnatic Flute. The venu is discussed as an important musical instrument in the Natya Shastra, the classic Hindu text on music and performance arts. The ancient Sanskrit texts of India describe other side blown flutes such as the murali and vamsika, but sometimes these terms are used interchangeably. A venu has six holes, is about the thickness of a thumb, and twelve fingers long. A longer murali has four holes and two hands longs. The vamsika has eight holes, between twelve and seventeen fingers long. A venu is a part of the iconography of Hindu god Krishna. One of the oldest musical instruments of India, the instrument is a key-less transverse flute made of bamboo. The fingers of both hands are used to close and open the holes. It has a blowing hole near one end, and eight closely placed finger holes. The instrument comes in various sizes. The venu is also a highly respected instrument and those who play it are expected to appreciate it, for it is considered a gift to be able to play it. The venu is capable of producing two and half octaves with the help of over-blowing and cross fingering. The flute is like the human voice in that it is monophonic and also has a typical two and half octave sound reproduction.