Thread:Gp75motorsports/@comment-27716498-20160207211417/@comment-4939977-20160208030853

The "#" sign indicates you want to go to one of the article's headings (Title X#Y indicates going to Heading Y of Title X). This is why we use a substitution for that sign (i.e. "♯") for numbers without going to the intended heading for the article.

Think "_Summer", linking to it will instead link to the season summer instead of the anime (while it should be "Underbar Summer").

So, it's basically how every wiki's technical restrictions work.