These stones called Veyala Vari (comes on top of the sunshade) It is the last course for the Nandi Mandapam. On top of it will be karna kudoo which completes the Nandi Mandapam. This is the front view visible from the ground. In front is a detailed ornamental carving. In the side you see the magaram. The piece is not attached to the main stone but carved from the same stone..
it is the same course but the magaram is seen in the front.
The letter "Ya" in the Panchakshara Mantra, Namasivaya, stands for the soul. Bodhinatha uses the Panchakshara Mantra to show how the soul is initially drawn by Siva's veiling grace, which leads the soul to maturity through experience in the world. Then comes Siva's revealing grace. When we've had enough of the world, Siva's grace pulls us toward God. The mantra also has the simple, two-syllable form. Si- Reflecting on God the Transcendent Absolute, Va-God as the All Pervading Consciousness