No SIGNAL, no plan.
Game of Thrones Season 2, Episode 9
The SIGNAL for the attack
will be a bonfire.
Game of Thrones Season 4, Episode 1
-perhaps we could come up with a SIGNAL!
-(DOOR SLAMS)
The Big Bang Theory Season 10, Episode 16
Study this SIGNAL exclusively.
Only this one.
Money Heist Season 3, Episode 5
I'm doing some experiments
to show that the SIGNAL to move a muscle
The Big Bang Theory Season 10, Episode 19