The superscript is generated by a {{dn}} tag, like this:
[[link]]{{dn}}
The tag is used on a link to a disambiguation page that needs to be repaired but for some reason is difficult to repair. This page is a short guide to repairing these links.
If the tagged link does not go to a disambiguation page, delete the tag.
Determine why the link is tagged.
Examine the articles listed on the disambiguation page, and check for notes about the link on the article talk page. You may also need to do some research outside of Wikipedia, or improve the disambiguation page (see examples below).
It is important to repair links correctly. Usually the intended meaning will be clear from the context in which it used. If it is not clear, do not guess; just leave the tag alone and explain the problem on the article's talk page.
Repairing link to disambiguation page - [[Wikipedia:DPL|You can help!]]
Some links to a disambiguation page are appropriate. Such links usually appear in an article's hatnotes and See also section, and do not merit a {{dn}} tag. Explicitly linking to the disambiguation page is usually done as Link (disambiguation).
In December 2009 an editor found in the article Ashcombe mention of a church with 13th century "lancets". The disambiguation page listed two relevant articles: Lancet arch and Lancet window, the latter being a window (glass) set in the former. To know which article should be linked from Ashcombe, it is necessary to research that church. The editor left a {{dn}} tag on "lancets" and a note on Talk:Ashcombe. A second editor found a reliable source about 13th century lancet windows in this church, and revised the article, fixing the link and removing its tag.
In November 2009 an editor put {{dn}} in the article Anostomidae on the link to Basin. A month later, a second editor repaired the link, changing the surrounding text from
Tools are available to help editors find and fix links to disambiguation pages. For more information and help, see these projects and their talk pages: