This is atracking category.

It is used to build and maintain a list or lists of pages—primarily for the sake of the lists themselves and their use in article and category maintenance. It is not part of theencyclopedia's categorization scheme.

More information:

• This category ishidden on itsmember pages—unless the correspondinguser preference (Appearance → Show hidden categories) is set.
• These categories are used to track, build and organize lists of pages needing "attentionen masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience.
• These categories also serve to aggregate members of several lists or subcategories into a larger, more efficient list (discriminated by classifications).
• Typically, tracking categories are automatically populated by templates invoked in pages or by the MediaWiki software (seeSpecial:TrackingCategories for an overview of the latter).

Administrators: Please do not delete this category as empty!

This category may be empty occasionally or even most of the time.

Articles are placed in this category automatically when either the day, month, or year is invalid in one of the templates related to human birth dates, death dates, and ages. These templates are listed in the navbox below:

Articles should not be placed in this category manually. To remove articles from this category, find the error message, which looks likeinvalid day,invalid month, orinvalid year in the article and fix the error.Note that many errors of this type are caused by vandalism. Check the page history to see if clicking "undo" is better than a manual fix.Common errors in these templates (other than typos) include:

• Parameters in wrong order, for example "20|8|1993". Should always be "year|month|day".
• Month and day transposed, for example "1974|16|01" (year|day|month). Fix by swapping month and day, for example "1974|01|16" (year|month|day)
• Year (and possibly month) of birth is known, but the day of the month is unknown.
  • To show birth year and age for living people, use{{birth year and age}} instead of{{birth date and age}}.
  • To show just the birth year, use{{Birth year}}.
  • For dead people, use{{Death date and age}}, providing only the birth year (or year and month).
• {{Birth date and age}} and{{Birth year and age}} should not be used for people who are dead, for example {{Birth date and age|1853|05|12}}. Use{{Birth date}} or{{Birth year}} instead.
• People whose calculated age is 130 years or more; theoldest verified human life span is 122 years. Wrap plain-text years in one of the appropriate templates listed above.

Certain combinations of incomplete dates are not available in the parameter-based templates.

• Biography templates parameter issues
• Date templates parameter issues

• Hidden categories
• Tracking categories
• Automatic category TOC generates no TOC
• Automatic category TOC on pages where PAGESINCATEGORY returns zero