[IdiotSavage]

More fun facts:

Omitting those characters makes it good for generating passwords if they need to be typed in by hand.

Double-clicking a base58 string always selects the whole string and it doesn't wrap accidentally, thanks to missing / and +, so it's also convenient to copy and paste.

[wasabi991011]

Unfortunately, no special characters means that a base58 string will often be rejected as a secure enough password.