Um Tam Tham Dam Dham Nam to Hearing, Touch, Eyes, Tongue, Nose Um to the middle fingers Namah. Um Tam Tham Dam Dham Nam to Speech, Hands, Feet, Genitals, Anus Aim to the ring fingers Namah. Om Pam Pham Bam Bham Mam to Talking, Giving, Moving, Enjoying, Excreting Aum to the little fingers Namah. Internal meditations Yantras may also be visualised internally. That, for example, is the case with the Shri Yantra, with the different mandalas starting at the base of the spine and going to the top of the head.
Different rituals exist for the purification of a yantra for the eight materials mentioned above.
This which follows is drawn from the Devirahasya . Shiva is the Seer, Trishtubh the Metre, Parashakti the Devata, Shrim the Bija, Hrim the Shakti and Klim the Peg. The application is the purification of the given yantra. After doing hand and limb nyasa, one should meditate on the throne of the given Devi as being in one's heart. One should draw, engrave, or paint the yantra, and place it on a gold colour pedestal, installing breath into it.