Hidden categories aren't shown in the list of categories at the bottom of the page, unless the "Show hidden categories" preference is checked.
A category is marked as hidden by putting the __HIDDENCAT__
magic word on the category page. It is automatically added to this category.
Subcategories
This category has the following 10 subcategories, out of 10 total.
O
- Old usage of HP template (empty)
P
- Pages missing hardness stat (24 P)
- Pages with script errors (empty)
S
- Soft redirects (940 P)