There's more! - base 58 - Satoshi's/Bitcoin's https://en.wikipedia.org/wiki/Binary-to-text_encoding#Base58 https://en.wikipedia.org/wiki/Binary-to-text_encodi

There's more! - base 58 - Satoshi's/Bitcoin's https://en.wikipedia.org/wiki/Binary-to-text_encoding#Base58 https://en.wikipedia.org/wiki/Binary-to-text_encoding#Base58 - "base62" - Keybase's saltpack https://github.com/keybase/saltpack https://github.com/keybase/saltpack - The famous "Adobe 85" - https://en.wikipedia.org/wiki/Ascii85 https://en.wikipedia.org/wiki/Ascii85 - basE91 - https://base91.sourceforge.net https://base91.sourceforge.net At work we defined several new "bases" for QR code. IMHO, it is an under applied area of computer science.