Lord Ganesha, the god of knowledge and the remover of obstacles is also the elder son of Lord Shiva. Lord Ganesha is also called Vinayak (knowledgeable) or Vighneshwer (god to remove obstacles). He is worshipped, or at least remembered, in the beginning of any auspicious performance for blessings and auspiciousness.
Lord Ganesha has elephant's head, four hands and a big belly. His vehicle is a tiny mouse. In his hands he carries a rope (to carry devotees to the truth), an axe (to cut devotees' attachments), and a sweet dessert ball -laddoo- (to reward devotees for spiritual activity). His fourth hand's palm is always extended to bless people.
A unique combination of his elephant-like head and a quick moving tiny mouse vehicle represents tremendous wisdom, intelligence, and presence of mind