There was a thread on this.

This post thee:

http://list.indology.info/pipermail/indology_list.indology.info/2016-January/042599.html

should be useful to her.

On Sat, May 7, 2016 at 12:00 AM, Corinna Wessels-Mevissen via INDOLOGY <indology@list.indology.info> wrote:
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---------- Forwarded message ----------
From: Corinna Wessels-Mevissen <corinnawessels@yahoo.de>
To: "indology@list.indology.info" <indology@list.indology.info>
Cc: 
Date: Fri, 6 May 2016 18:29:24 +0000 (UTC)
Subject: Early Representations of OM
Dear All,

A colleague of mine, who is not a List member, Prof. Doris M. Srinivasan, asks the following question on the part of a recent Harvard PhD, who worked on the development of OM in the Vedas:

"Does any one have knowledge and/or references regarding the imagery (sculpture; images on manuscripts; any sort of visual renderings) of OM from any period through the medieval period?"

Kindly either write to her directly (dmswh@earthlink.net), to me off-list, or to the List, of course. Thank you!

Best wishes,

Corinna Wessels-Mevissen




--
Nagaraj Paturi
 
Hyderabad, Telangana, INDIA.
 
Former Senior Professor of Cultural Studies
 
FLAME School of Communication and FLAME School of  Liberal Education,
 
(Pune, Maharashtra, INDIA )