Comment by alephnerd

They used Quipu to catalog most administrative information (taxes, census, military, etc) - https://en.m.wikipedia.org/wiki/Quipu

Quipu's are actually pretty cool - it's basically a proto-flamegraph and could even potentially be used alphabetically, but we wouldn't really know as there just aren't that many left after the brutal Spanish invasion of the Inca empire and the subsequent inquisition.