Subatomic particles.
The Big Bang Theory Season 12, Episode 20
I can't see SUBATOMIC particles,
but nevertheless, they're there.
The Big Bang Theory Season 4, Episode 3
...are not being squandered
chasing SUBATOMIC wild geese...
The Big Bang Theory Season 2, Episode 3
What exactly are SUBATOMIC particles?
The Big Bang Theory Season 3, Episode 10
It's SUBATOMIC particles
in endless aimless collision.
Breaking Bad Season 3, Episode 10