Shiva Purana
धेनुशंखाख्यमुद्रे च दर्शयेदथ देशिकः॥ पुनस्स्वपुरतश्शंखं दक्षिणे देश उत्तमे ॥ २२ ॥
Then the desika should show it in the seal called Dhenushankha. Again he placed the conch in front of him in an excellent place on the south.
english translation
dhenuzaMkhAkhyamudre ca darzayedatha dezikaH॥ punassvapuratazzaMkhaM dakSiNe deza uttame ॥ 22 ॥
hk transliteration by Sanscript