"
Universal Planetary Profile", a format for listing planet stats in Classic Traveller (and later). It used "hexadecimal" (actually goes beyond the digit 15 in some cases) to make every stat a single character, and runs them all together as a string of digits, so it might look something like
MyPlanet C77A9A9-6
(Starport type C, Size 7, atmosphere code 7, etc.)
Traveller also listed other things, like character stats, in similar profiles.