Natyashastra
अपक्रान्तार्धसूचिभ्यां तत्पृष्ठस्वस्तिकं भवेत् । पार्श्वयोरग्रतश्चैव यत्र श्लिष्टः करो भवेत् ॥ ७७॥
Pṛṣṭhasvastika—two arms after being thrown up and down coming together as a Svastika, two feet also to come together as a Svastika with Apakrānta and Ardhasūcī Cārīs.
english translation
apakrAntArdhasUcibhyAM tatpRSThasvastikaM bhavet । pArzvayoragratazcaiva yatra zliSTaH karo bhavet ॥ 77॥
hk transliteration by Sanscript