Penguin Diagram
Source
While on the subject on Feynman diagrams and names... You know the Tadpole?
In 1985 Coleman stated (perhaps as a joke) that Physical Review’s editors rejected the originally proposed name "spermion".
https://en.m.wikipedia.org/wiki/Tadpole_(physics)
Omg what a name
I heard it from another source, and then the story was that he called it tadpole, and the editor complained that it sounds too silly. So then he said "well, then I'm going to call it a spermion", and the editor shuts up after that.