Thread:HiccstridFan92/@comment-91810-20140105061044/@comment-31352869-20140106152840

It is one of the categories that represent a first letter of a page. This is used to help sort the pictures into categories alphabetically. For example in the page above as I did, it would get the category M because it starts with the letter M. On the category page for M the description of the category is  Content beginning with the letter M, excluding redirects and disambiguation pages.