Lord Shiva is worshipped in his “SAGUNA”aspect in the form of Shiva lingam. Generally the Siva Bhaktas (Saivites) do Panchayatana Puja. In this puja, Siva, Ganesha, Parbati, Suryanarayana and Salagram are duly worshipped. Linga means "MARK" in Sanskrit. It is a symbol , which points to an inference... This vast world of countless forms is a linga of the omnipotent lord.. a symbol... When you look at the linga, your mind is at once elevated and you begin to think of the Lord.