What is "vayilar"

Vayilar (literally "The Voiceless One"), also known as Vayilan, Vayila Nayanar, Vayilar Nayanar and Vayilar of Mayilai, was a Nayanar saint, venerated in the Hindu sect of Shaivism. He is generally counted as the fifty-first in the list of 63 Nayanars. He is said to worshipped the god Shiva, his patron, by his Mind and built a grand temple for him in his mind.