@mjd Reading this Wikipedia article made me think of your worst maths notations examples: https://en.m.wikipedia.org/wiki/Mating_of_yeast
Yeast mating sexually can have two mating types. They're not called type 1 and type 2, or type A and type B. Instead, it's type a and type α.
Not a biologist, so I don't know if there's a good reason for that horrible naming.


🏳️⚧️