Well here is a matter of unparalleled triviality, but one that I can't seem to get out of my head (and a reason why I sometimes suspect I have Asperger's):
I like alphanumeric signifiers better than all-numeric ones. If it is alphamanumeric, it has letters as well as numbers, rather than just numbers. And I am more of a literary guy than a numerary guy, so letters make me happy.
My company's interoffice mail codes all start with a letter and are followed by 4 numbers, dash 3 numbers (T5359-012). I used to work for Polaroid, and their "cost centers" were letter-number-number. Mine was L36, which beats the one at my current company, where they're all 5 numeric digits. (However, my current company still exists; so it has that edge...)
Canadian and British postal codes kick ass for the same reason.
So, if you ever are tasked to assign new cost-center ID
's for a major enterprise, or new postal codes for a whole nation, pr any other project that requires creation of myriad identifiers for things, do your pal stuey a favor and make them all alphanumeric instead of purely numerical.
There I said it; got it out of my mind. (Right, like it'll stay out of my mind now.)
Now lemme go find my meds. (Wonder which club is serving them 2nite...)
Pancakes are delicious.