Worship of lingam is nothing but the worship of god Shiva. It is very much considered to be the divine phallus, containing within it the seed of the universe. It is considered that this seed has created all the life of the universe. It is also the symbol of shakti.
Lingam is a rounded shape rounded shape upright stone used as a symbol to god Shiva. Lingam means a sign or characteristic. It is a Sanskrit word which means symbol. It indicates the formless aspect of the god Shiva.
All over India we find thousands of lingams. Some of them have special importance. One of the most important lingam is Jyotirlingas. It is the collection of twelve lingams, they are Somnatha, Malllikarjuna, Mahakala, Omkara, Kedara, Bhimshankara, Vishvanatha, Tryambaka, Vaidynatha, Nagesha, Rameswara and Ghushnesha. Most of these are formed by themselves, but some of them are formed by human hands.
Lingam has great importance in human beings. It balances the male and female energies. The Lingham is used in meditation and crystal healing and it has the power to ward off any negative energy. It is nothing but the active aspect of shakti. One of the rare lingams was found in Madurantagam, 77 km south west of Chennai. It was six-feet tall and 1.5 feet wide. The granite Shiva Lingam would be around 600 years-old and belong to Later Chola period. Black Shiva lingam is also a rare and sacred lingam. This lingam has highly protective energies. This black Shiva lingam is found besides the Narmada River. It is imade of Crypto Crystaline Quartz.