User blog comment:PsiCubed2/Letter Notation Part III/@comment-80.98.179.160-20171108082401/@comment-27516045-20171108104620

You don't need to make two comments about the same thing on the same blog post (not to mention a third on a different post) to get yourp oint across.

And it's Psi's preference. He wouldn't really use "A" and "B" anyway (it starts at E) and Z is a long way off.