What is "pusalar"

Pusalar (also spelt as Poosalar), also known as Pusalar Nayanar (Poosalar Nayanar) and Pusala Nayanar, is an eighth-century Nayanar saint, venerated in the Hindu sect of Shaivism. He is generally counted as the fifth-eighth in the list of 63 Nayanars. His hagiography speaks how he created a grand temple for Shiva in his mind and how his patron god Shiva preferred attending the consecration of his mind temple, instead of a grand temple created by a Pallava king.