Positioning of the Hands

Palms upward, or facing outwards, is indicative of submission, vulnerability, and surrender to the Master.

"I noted that the palm of her hands, so soft, so vulnerable, had turned on her thighs, so that they faced up. Among slave girls this is a common ways of signaling need, helplessness, a desire to please."
~Vagabonds of Gor, page 209 ~

Fingers spread wide apart is further indication of both vulnerability to the Master, and desire for Him.