You know, someone should invent an infinite sequence of ordinal symbols which we could use to place things in a sequence. It could start with a simple vertical line, something like "1". Maybe someone more clever than me can come up with the next symbol.
Unfortunately, I lost track of how Mac OS X was numbered after 10.7.whatever the last iteration was.
Doesn't much matter, since 10.6.8 was the last version I truly enjoyed using.