I knew about files like /etc/services, for common IP port usages, and /usr/share/zoneinfo, for time zones, but I didn’t know that DragonFly (along with other systems) keeps a list of agreed names for various human languages defined by ISO639 in /share/misc/iso639, and it’s maintained at least in part by the Library of Congress.  At least I didn’t know until Sascha Wildner updated it.

Updated: Birthstones and flowers.  Don’t know why.