This category contains a set of pages in a particular group. It should only contain individual black symbols, as well as subcategories and lists of black symbols. Topics related to the set or an individual black symbol should be placed in relevant topic categories, such as Category:Symbols.
This is a set category. It should only contain pages that are black symbols or lists of black symbols, as well as subcategories containing those things. Topics about black symbols in general should be placed in relevant topic categories. Categories related to only an individual black symbol should not be in this category.