These are categories that simply aren't listed at the bottom of a page that has been included in such a category. This is done to keep the UX clean, but when a page needs to be categorized for a reason like SMW (automation and other reasons).
Subcategories
This category has the following 4 subcategories, out of 4 total.
P
- Portable Building Infoboxes (32 P)
- Portable Infoboxes (32 P)