Natyashastra
दशाख्यश्च शताख्यश्च सहस्राख्यस्तथैव च । अतः परं प्रवक्ष्यामि त्रिपताकस्य लक्षणम् ॥ २७॥
The Tripatāka hand is formed by bending the third finger of the Patāka hand. Now, I shall describe its characteristics in detail.
english translation
dazAkhyazca zatAkhyazca sahasrAkhyastathaiva ca । ataH paraM pravakSyAmi tripatAkasya lakSaNam ॥ 27॥
hk transliteration by Sanscript