4 ms·

I would guess it is derived from: https://en.wikipedia.org/wiki/Iron(III)_oxide https://en.wikipedia.org/wiki/Iron(III)_oxide

• smlckz 6y ago
  But that's Fe_2 O_3 !
  • ziml77 6y ago
    I think calling it Py2O3 would be a bit confusing though.
    • smlckz 6y ago
      Just PyO or Py_3 O_4 could have been used as well, does not matter that much.
• OskarS 6y ago
  I thought it was like the compiler flag, -O3. ”With full optimization”, basically.