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.
Think-CONSIDER:
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.
Mull over:
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.)