palm-fist_tap
Sometimes when a character has a realization moment, they may reflect it by holding one hand out (palm-side up) and tapping the palm with the other fist (side opposite of the thumb).
h4. See also
* light bulb
* fist in hand
* palm-fist greeting
* Tag Group:Gestures
h4. External links
* TVTropes: Palm-Fist Tap