![A sigma particle.
A sigma particle.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
A sigma PARTICLE.
The Big Bang Theory Season 1, Episode 13
![But Penny has no interest
in subatomic particle research.
But Penny has no interest
in subatomic particle research.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
But Penny has no interest
in subatomic PARTICLE research.
The Big Bang Theory Season 3, Episode 15
![inventing a new
dark matter particle
inventing a new
dark matter particle](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
inventing a new
dark matter PARTICLE
The Big Bang Theory Season 11, Episode 13
![Senior theoretical particle physicist
at CaITech, focusing on M Theory.
Senior theoretical particle physicist
at CaITech, focusing on M Theory.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
Senior theoretical PARTICLE physicist
at CaITech, focusing on M Theory.
The Big Bang Theory Season 3, Episode 14
![You'd be surprised how many
particle physicists have a whimsical side.
You'd be surprised how many
particle physicists have a whimsical side.](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
You'd be surprised how many
PARTICLE physicists have a whimsical side.
The Big Bang Theory Season 2, Episode 13