This is the interface message displayed before the listing of categories with the attribute __HIDDENCAT__. By default these categories are not displayed in namespaces other than the Category namespace. In the Category namespace, they are labelled "Non-topical/index" (because they are always displayed). Otherwise, they are labelled "hidden category" or "hidden categories" if they are displayed, depending on how many there are to display. See COM:HIDDENCAT. Note: The "Non-topical/index" label may not be used in other languages, in which case the label "hidden categories" will be used.