Often in anime, I've noticed a gesture is done when a character remembers a previous event of theirs, or something comes to mind. One hand is made into a fist, of which the bottom of it will fall flat onto their palm of the other hand, sometimes followed by a quip or phrase such as "Hold on!" or "That's it!" indicating they have realized new means.
I'm not sure else how to refer to the hand gesture, and that's my question. What is this hand gesture called? I had tried looking up some gif images of it for reference to add to a group joke, but had no luck with getting the right name for it or finding anything relevant.