The hand used on my marketing materials is a rock art image printed by Bushmen (San) on a cave wall in southern Africa.
"Potency was associated with the hands. Bushman shamans cured by laying hands and drawing the sickness out of a patient and into their own bodies. A particular feeling was associated with potency and curing."
Lewis Williams and Dowson, Images of Power, Understanding Bushman Rock Art, 1989.
"Hand prints are patently very different form fine line paintings. They represent a conceptual and technical departure from the carefully drawn images of humans and animals which characterize much of the earlier art."
Anthony Manhire, The Role of Hand Prints in the Rock Art of the South-Western Cape, SA Archeology Bulletin, December 1998, Vol LIII No. 168
"You can't shake hands with a clenshed fist!" -Indira Ghandi
"Your hand opens and closes, opens and closes. If it were always a fist, or always stretched open, you would be paralyzed."
The hand is ambiguous. Its meaning uncertain. I choose to see it this way:
The Hand is open. It is not clenched.
The fingers are streched open, not closed.
The hand is lifted upward.
It acknowledges and welcomes you.