If you look at Huygens, light is a WAVE,
as confirmed by the double-slit experiments.
The Big Bang Theory Season 1, Episode 1
when the WAVE function collapses?
The Big Bang Theory Season 10, Episode 19
I built a cobra WAVE.
You want to do that?
The Big Bang Theory Season 11, Episode 13
She's clear.
Wave her through.
Westworld Season 2, Episode 10
...caused by relative motion between
the source of the WAVE and the observer.
The Big Bang Theory Season 1, Episode 6