...the dark matter SIGNAL found
in sodium-iodide crystals by the Italians.
The Big Bang Theory Season 2, Episode 15
My spare glasses are in my bedroom,
on my dresser, next to my bat SIGNAL.
The Big Bang Theory Season 1, Episode 11
to give you the SIGNAL
to light the trench.
Game of Thrones Season 8, Episode 2
How will we see your SIGNAL?
Game of Thrones Season 3, Episode 3
When Mance gives the SIGNAL
and we hit Castle Black,
Game of Thrones Season 3, Episode 7