Natyashastra
पार्श्वोन्मुखी स्याद्वलिता ग्रीवाभेदैश्च वीक्षणे । निवृताभिमुखीभूता स्वस्थानाभिमुखादिषु ॥ १७६॥
Vāhitā is when the neck turns sideways, used in looking around. Nivṛttā is when the neck faces forward, indicating a return to one’s place or direction.
english translation
pArzvonmukhI syAdvalitA grIvAbhedaizca vIkSaNe । nivRtAbhimukhIbhUtA svasthAnAbhimukhAdiSu ॥ 176॥
hk transliteration by Sanscript