This is an interesting alphabet, even Base58 (Bitcoin addresses) have "o" and "1". There's some information on how they generated it here in the spec[1]. The

This is an interesting alphabet, even Base58 (Bitcoin addresses) have "o" and "1". There's some information on how they generated it here in the spec[1]. The characters that are used in Open Location Codes were chosen by computing all possible 20 character combinations from 0-9A-Z and scoring them on how well they spell 10,000 words from over 30 languages. This was to avoid, as far as possible, Open Location Codes being generated that included recognisable words. The selected 20 character set is made up of "23456789CFGHJMPQRVWX". [1]: https://github.com/google/open-location-code/blob/master/docs/olc_definition.adoc#open-location-code https://github.com/google/open-location-code/blob/master/doc...