This is a container category. Due to its scope, it should contain only subcategories.

This category contains only subcategories, which are added to this category using ((Unknown parameters category)).

Infoboxes and WikiProject templates are categorised into their own subcategories:

• Category:Infoboxes with unknown parameters (633)
• Category:WikiProject templates with unknown parameters (21,393)

Articles are typically added to subcategories of this category when they use templates that incorporate Module:Check for unknown parameters.