Location: forehead, off to the right a bit
Orientation: palm back
Movement: The sign starts an inch or two away from the head
and then touches the index finger to the forehead.
Here's the sign "THINK" as in "think about." Ponder.
Move the tip of the index finger in a small circle in front of the forehead.
The hand is in an "AND" handshape. The fingers flutter as if showing
intense brain activity.
SLIPPED-MIND or "lose your thought"
"I THINK SO." (But I'm not sure.)