This category is a "meta-category", or in other words a category of categories. Categories that would normally be otherwise top-level go here. This is an effort to keep Special:UncategorizedCategories empty. This also means that the Meta category goes into the Meta category.
Pages of interest to this category:
This category has the following 8 subcategories, out of 8 total.
Pages in category "Meta"
This category contains only the following page.