is shown as the head of that vĕdham as said in ṣruthi ṣirasividheepthĕ, —

 on its head —

seated on my head —

 atop the tall roofs —

 on the head —

 ŏh ŏne who stood at the top of tall and great thirumalai! —

(thus) staying on my head —

 on top of the snake, kāl̤iya-s hood —

 ŏh ŏne who stood at the top of cool divine thirumalai (thiruvĕnkatam)! —

on top —

 atop —