Quote Originally Posted by sarabhanga View Post
I am not sure, however, that IMkAra (or any variation) actually appears in the Rgveda; and I don’t recall any reference to IM as the praNava.
Namaste Sarabhanga,

Shrisukta has a line "tAm IshvarIm IM sharaNam prapadye" (citing from memory). And one Rigvedic passage mentions "chatvAra IM" which according to Srividya adepts refers to four kAmakalA-bIjas in kAdi-panchadashI.

Re designation of "IM" as pranava i know from oral tradition which goes from Sri Bhaskararaya (my SV Guru belongs to this line).