Okay, apparently there is not an agreed name on this, so I guess the most appropiate name to understand what I’m talking about is quote fingers gesture. You know, it’s this gesture you make with your two index and middle fingers in the air imitating the meaning of quotation marks or inverted commas in writing (” “).
So I heard ‘hook fingers’ to refer to this (yes, of course, in Bones, where else?) because you make like a hook with your fingers, but I can´t find a reference to this anywhere, so normally it’s called just ‘quote fingers’ or ‘air quotes‘.
You can see different ideas about it in this forum:
And well, to finish, I just can´t resist to put the video of Friends about it; it’s way too funny.