D'ni numerals were base 25, not 20. Each digit is composed of two base-5 "sub-digits" superimposed at 90° to each other -- the digits are designed such that thi

D'ni numerals were base 25, not 20. Each digit is composed of two base-5 "sub-digits" superimposed at 90° to each other -- the digits are designed such that this is unambiguous.