Uh. Well for a curved , well I was thinking to  f for to sit in your  the palm of your hand. Uh maybe like this , with the uh joy pad here. Joystick here. And maybe um an okay button around here , so that the thumb can uh use it quite easily. Um I don't exactly   Double curved. It probably means  this is probably double curved. Uh whereas a single curved would be like that. I guess. Or not necessarily.
So it might literally just be
Two curves .
okay.