Shiva Purana
मध्यमानामिकांगुल्या मध्ये तु प्रतिलोमतः । अंगुष्ठेन कृता रेखा त्रिपुंड्राख्या भिधीयते ८६ ।
With the middle and the ring fingers a line drawn in the opposite direction is called Tripuṇḍra.
english translation
madhyamAnAmikAMgulyA madhye tu pratilomataH । aMguSThena kRtA rekhA tripuMDrAkhyA bhidhIyate 86 ।
hk transliteration by Sanscript