Shiva , perhaps the most ancient of the Indian deities , and the third of the Hindu Trinity -- one of the most widely worshipped and edified deity in the Hindu pantheon , is worshipped often in the form of the lingam , or phallus . Shiva , the ( arguably ) most ancient of the Indian deities with prehistoric origins , and the third of the Hindu Trinity -- one of the most widely worshipped and edified deity in the Hindu pantheon , is worshipped much more commonly in the form of the Lingam , or the phallus .