User blog comment:JoshuaJSlone/Wiki Business: Namespaces, Favicon/@comment-24833026-20150126220438/@comment-131168-20150127150936

You're right, it probably would be confusing to have "Sub:". Some of the pages currently in Forum: might make sense as actual sub-pages, except that would be confusing too--almost always a / in the main namespace really means there's a multiple A-side going on.