Lingam (Sanskrit for "shaft of light") is the term for the Hindu god Shiva as represented by a phallus (erect male organ). Usually found in conjunction with the Yoni ('vulva") which represents the goddess Shakti - the source of Creative Energy. They co-join to form Bhrama - the Universe. This is the Hindu Trilogy; the representation of the twins of Creation and Destruction as the highest manifestations or aspects of the One (Bhrama).
The aniconic representation of Lord Shiva in Hinduism. Shiva of the highest level is limitless, formless, transcendental and beyond human perception. Shiva is therefore worshipped by a formless mark, the lingam. The popular Hindu connotation associated with lingam is that of a "pillar of fire" from which Shiva arose. The connotation professed in the West is that of the human male organ.
The emergence of Lord Shiva from the lingam is known as Ligodbhava.