Natyashastra
चतुरस्त्रस्थितौ हस्तौ हंसपक्षकृतौ तथा । तिर्यक्स्थितौ चाभिमुखौ ज्ञेयौ तालमुखाविति ॥ १८७॥
The two hands, positioned in a square shape, and those shaped like Haṃsapakṣa, when placed obliquely facing each other, are known as Talamukha hands.
english translation
caturastrasthitau hastau haMsapakSakRtau tathA । tiryaksthitau cAbhimukhau jJeyau tAlamukhAviti ॥ 187॥
hk transliteration by Sanscript