Shiva Lingam represents the unity of creation.  For this reason it is often used to help with fertility, a perfect fusion of of the male and female Shiv Shakti energies.   It is a powrful stone aligned to all the chakras, zodiac signs, elements and numbers.  It's great for exploring divine energy and sacred masculine energies.  It helps to bring you into full balance and empowerment, connecting you with the divine both with-out you and within you
 
Chakra: All