I use chemical elements at home. They have nice short abbreviations that can be used mnemonically, e.g. mo (molybdenum) is my modem and pr (praseodymium) is my printer. And if I somehow lose DNS and /etc/hosts on every machine, I can still look up their IPv4 addresses in a book.

I've been rotating a subset of these for years: jqa mvb whh jkp usg rbh jag caa wht wgh fdr hst dde jfk lbj

That is another useful short and long scheme as long as one needs under 46 and I wonder if any are duplicated yet?