[Advaita-l] Is Brahman saguNa or nirguNa or aguNa?

[Venkata sriram P]

Pujya Pranipataji,
 
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vedAntasAra of sadAnandaji, adhikArilakShaNa---
adhikAri tu. . . kAmya niShiddha varjana puraHsaram . . . upAsanA anuShthAnena. . .

murti to refer vigraha(arcAvatAramUrti); pratimA to omkAra; linga to saligrAma etc.

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Pls clarify whether "omkara" is pratimA or not.  
 
I have read elsewhere that "Omkara" is "AlaMbanaM" and pratika / pratima are sAlagrAma, narmada bAna linga etc.  
 
There is a difference between AlaMbanaM and pratimA.  Examples of AlaMbanaM are praNava, daharAkAsa in hridaya puNDarIka etc. that are NOT kArya-brahma whereas
sAlagrAma / linga in the form of pratIka / pratima are kArya-brahma.  
 
BTW, both (AlaMbana & pratIka) can be adopted for the purpose of upAsana that leads to chitta shuddhi.
 
regs,
Sriram