
...the PRINCIPLE that a physical system exists
partially in all its possible states at once.
The Big Bang Theory Season 6, Episode 19

of Heisenberg's
uncertainty PRINCIPLE,
The Big Bang Theory Season 5, Episode 5

You can think about Heisenberg's
uncertainty PRINCIPLE...
The Big Bang Theory Season 4, Episode 20

Leonard, where do you stand
on the anthropic PRINCIPLE?
The Big Bang Theory Season 6, Episode 1

In PRINCIPLE, you have a point.
The Big Bang Theory Season 1, Episode 15