Natyashastra
खटकः खटके न्यस्तः खटकावर्धमानकः । शृङ्गारार्थेषु योक्तव्यः प्रणामकरणे तथा ॥ १३७॥
Kaṭakāvardhamānaka—When one Kaṭakā (mukha) hand is placed on [the wrist of] another Kaṭakā [mukha] hand, the Kaṭakāvardhamānaka hand will be produced. (Uses): It is to be used in movements connected with love-making and in bowing [to a person].
english translation
khaTakaH khaTake nyastaH khaTakAvardhamAnakaH । zaRGgArArtheSu yoktavyaH praNAmakaraNe tathA ॥ 137॥
hk transliteration by Sanscript