They couldn't use, "Nu" because it would turn into an Abbott and Costello routine.
Costello: So whats the name for this new variant? Abbott: Nu Costello:I know it's new, but what's it's name? Abbott: Nu Costello: I know it's new, but didn't they give it a name? Abbott: Yes, the nu variant. Costello: But all the other variants had names. Abbott: Right Costello: So why didn't they give this one a name? Abbott: They did. Costello: Then why won't you tell me the name? Abbott: I did tell you, the variant is Nu.
