
Multiplied by a MATRIX
of negative I comma zero...
The Big Bang Theory Season 5, Episode 7

He recommended that I go see
the third Matrix movie...
The Big Bang Theory Season 4, Episode 7

You know how I know
we're not in the Matrix?
The Big Bang Theory Season 2, Episode 2

the calculation
of nuclear MATRIX elements.
The Big Bang Theory Season 7, Episode 20