Spiritual Meaning:
A hand with a finger pointing the way signifies the spiritual direction  to be taken. When the thumb and middle finger are held together it suggests suppression of the Ego (the conscious self).

Psychological / Emotional Perspective:
When we become conscious in dreams of the fingers on a hand we are often being given important information. A beckoning finger is encouragement, whereas if the fourth or ring finger is more noticeable, love of a selfless kind is suggested. If the little finger is crooked traditionally there may be some deviousness around.

Everyday Material Aspects:
When the fingers are splayed, this can suggest openness and honesty;  when curled towards the palm, information is being hidden. If bunched into a fist there is aggression against us. If the fingers on both hands are interlaced, some self-control is necessary.

You might also like to consult the entry for Hand in Body.