There is an interesting proposal for the Brahmi representation of Om in this conversation here:

https://www.quora.com/Ancient-India-How-was-the-symbol-OM-written-in-Brahmi-script

One Kingsley Jegan Joseph writes here :

If it was written (I haven't seen one actually written in an inscription), it would look something like this.

On Sat, May 7, 2016 at 6:06 AM, Harry Spier <hspier.muktabodha@gmail.com> wrote:

I'm more than happy to forward the articles sent to me on OM but none
of them were about the representation of OM.

Harry Spier

On 5/6/16, Nagaraj Paturi <nagarajpaturi@gmail.com> wrote:
> In
>
> http://list.indology.info/pipermail/indology_list.indology.info/2016-January/042596.html
>
> Harry Spier thanked list members for sending articles on OM.
>
> Contacting him should be helpful to her.
>
> On Sat, May 7, 2016 at 12:19 AM, Nagaraj Paturi <nagarajpaturi@gmail.com>
> wrote:
>
>> Ganesh-Vidya: The Traditional Indian Approach to Phonetic Writing by L.
>> S. Wakankar has a discussion on the shape of om.
>>
>> On Sat, May 7, 2016 at 12:10 AM, Nagaraj Paturi <nagarajpaturi@gmail.com>
>> wrote:
>>
>>> 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:
>>>
>>>> _______________________________________________
>>>> INDOLOGY mailing list
>>>> INDOLOGY@list.indology.info
>>>> indology-owner@list.indology.info (messages to the list's managing
>>>> committee)
>>>> http://listinfo.indology.info (where you can change your list options
>>>> or unsubscribe)
>>>>
>>>> ---------- 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 )
>>>
>>>
>>>
>>>
>>
>>
>>
>> --
>> Nagaraj Paturi
>>
>> Hyderabad, Telangana, INDIA.
>>
>> Former Senior Professor of Cultural Studies
>>
>> FLAME School of Communication and FLAME School of  Liberal Education,
>>
>> (Pune, Maharashtra, INDIA )
>>
>>
>>
>>
>
>
>
> --
> Nagaraj Paturi
>
> Hyderabad, Telangana, INDIA.
>
> Former Senior Professor of Cultural Studies
>
> FLAME School of Communication and FLAME School of  Liberal Education,
>
> (Pune, Maharashtra, INDIA )
>

--

Nagaraj Paturi

 

Hyderabad, Telangana, INDIA.

 

Former Senior Professor of Cultural Studies

 

FLAME School of Communication and FLAME School of  Liberal Education,

 

(Pune, Maharashtra, INDIA )