The Nandi Bull. Symbol of virility, strength and devotion to Lord Shiva, the God of all Gods. Innumerable legends of Nandi abound (https://en.wikipedia.org/wiki/Nandi_(bull))
In Hindu Religion, he is the chief guru of eighteen spiritual masters (18 Siddhar ) including Patanjali and Thirumular.
Here is an imposing Nandi bull at the Visalatchi Mantap (temple) at the Art of Living International Centre, Bangalore. Sitting bang at the entrance of the main hall, cast in gleaming metal, he surely looks impressive !!! A true bull if there ever was one !!