Natyashastra
मध्यमाङ्गुष्ठसन्दंशो वक्रा चैव प्रदेशिनी । शेषे तलस्थे कर्तव्ये ताम्रचूलकरेऽङ्गुली ॥ १२२॥
The middle finger and the thumb pressed together like pincers, the forefinger bent, and the remaining fingers resting on the palm form the Tāmracūḍa hand.
english translation
madhyamAGguSThasandaMzo vakrA caiva pradezinI । zeSe talasthe kartavye tAmracUlakare'GgulI ॥ 122॥
hk transliteration by Sanscript