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I know Halloween was yesterday but let's discover this horror together with some terrifying Python[1]! Turns out, yep.

For upper → lower → upper we have:

Ω ω Ω

İ i̇ İ

K k K

Å å Å

ẞ ß SS

ϴ θ Θ

For lower → upper → lower there are a lot more.

Lowercasing the symbols for Ohm, Kelvin or Ångström makes no sense.

For the Greek alphabet cases, isn't there canonical forms for this kind of stuff?

Are those first two something other than Greek Omega and ascii K?

Yes, the Ohm, Kelvin and Ångström have their codepoints in Unicode.

fuck I hate unicode they are not different symbols

This is really cool! Thanks a lot for the effort!

But yeah, I got the idea from GP's "ff" example, but I'm kinda shocked there are so many.