Lord Shiva is worshipped in the form of Linga from ancient times. A Shiva Linga consists of three parts, the lowest of which is called the ‘Brahma-Pitha,’ the middle one, the ‘Vishnu-Pitha’ and the uppermost one, the ‘Shiva-Pitha.’here is a mysterious or indescribable power or ‘Shakti’ in the Linga, to induce concentration of the mind, and helps focus one’s attention. That is why the ancient sages and seers of India prescribed Linga to be installed in the temples of Lord Shiva.