- Fist to the chest
- "Hang 10" signal
- Tap the tip of the cap
- Nod
- Reposition your hat
- Swipe across the belt-buckle
I have seen them all used for various signals, it is important to hit it in the pregame so you both know what you are calling.
I prefer the Tap the tip of the cap, as it most resembles the IFF signal.
$0.02