
...he said that Johnny Depp
was in The Matrix.
The Big Bang Theory Season 6, Episode 6

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

I haven't seen him this stuck since he
tried to figure out the third Matrix movie.
The Big Bang Theory Season 3, Episode 14

You can see the MATRIX, can't you?
The Big Bang Theory Season 1, Episode 12

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