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 (634)
• Category:WikiProject templates with unknown parameters (3,405)

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