TV series example of the word

The Big Bang Theory Season 3, Episode 11
...known as Sheldon Alpha Five.

The Big Bang Theory Season 5, Episode 7
and gamma becomes alpha...

The Big Bang Theory Season 1, Episode 13
The answer is minus eight pi alpha.

The Big Bang Theory Season 8, Episode 21
<i>Just turn left at Alpha Centauri, you can't miss it.</i>

Westworld Season 2, Episode 8
Alpha 2.