Ganesha, son of Siva and Parvati, is the god of knowledge and thresholds.

Ganesha
From Encyclopedia Mythica. His head was chopped off and replaced with an elephant's. He is the god of knowledge, wisdom, literature, and fire.

Lord Ganesha is also called Vighneshvara or Vighnaharta. Ganesha is the lord of and destroyer of obstacles. Worship of him and four other gods (Vishnu, Shiva, Shakti and Surya) is called "panchaayatana puja."

One Third of a Billion Hindu Gods
Hinduisim

God or Goddess of the Day