Is there a sign for a question mark?

Is There a sign for a question mark or a statement? Or is it just your facial expression? 

Hi

if you look at lession 4.1,the 5 WH questions,you will find it there.I have seen Jake do the 'x' sign twice. i am pretty sure that is it. 

Also; many people draw a ? you know some one who is deaf/blind don't just walk up and tap their shoulders they will start yelling rape; you politely tap the a back of their hand, when they turn palm up you can draw the letters to them,and question mark in their palm then dot it this is also how you do it for two hand manual and Lorma Sign languages only in their hand using their palm as paper for deaf blind.