Natyashastra

siva.sh/natyashastra/4/64

उरू च वलितौ यस्मिन्वलितोरुकमुच्यते । आवर्त्य शुकतुण्डाख्यमूरुपृष्ठे निपातयेत् ॥ ६४॥

sanskrit

When the thighs are in a circular movement, it is known as the Valitoru, and the hands are placed on the thigh in the Śukatuṇḍa gesture, performing a circular motion.

english translation

urU ca valitau yasminvalitorukamucyate | Avartya zukatuNDAkhyamUrupRSThe nipAtayet || 64||

hk transliteration by Sanscript