Werepuppy's A Doll A Day Challenge 2020

[Alliecat]

I LOL'd too. Cheers for another run through the alphabet!

Definition: In old naval slang, an X-catcher or X-chaser was someone who was good at math—literally someone good at working out the value of x.

I wonder in which era and which navy. "Mental Floss"'s "x" page is interesting, but that's not a term I've come across before. I wonder where they got it.