We've posted an article listing the isometric types that are used within the OOTB catalogs for reference:
http://www.pdoteam.com/2012/08/isometric-types/
Also, if you haven't seen it, we have a pdf that lists the available skeys:
http://www.pdoteam.com/downloads/Symbol+Keys
I'm trying to get a more comprehensive list, and when I do, I'll update the spreadsheet, so you'll be able to see the changes.