Natyashastra
तथा च मण्डलं स्थानं मण्डलस्वस्तिकं तु तत् । निकुट्टितौ यदा हस्तौ स्वबाहुशिरसोऽन्तरे ॥ ६९॥
And so the circle is the position, and that is called the Maṇḍalasvastika. When the hands are crossed, placed between one's own arms and head.
english translation
tathA ca maNDalaM sthAnaM maNDalasvastikaM tu tat । nikuTTitau yadA hastau svabAhuziraso'ntare ॥ 69॥
hk transliteration by Sanscript