Help:Title restrictions
Some article titles cannot be named correctly due to software limitations.
Before the opening paragraph of the article, insert {{Template:wrongtitle|correct title}}. This will produce the following text:
The title given to this article is incorrect due to technical limitations. The correct title is (correct title).
For a list of articles that are subject to these limitations, see Special:Whatlinkshere/Template:Wrongtitle.
Excluded characters
The following characters are not allowed in page titles:
# + < > [ ] | { }
The following character is allowed but is impossible to link to from a namespace that supports subpages if it is the first character of the title:
/
The MediaWiki software also makes no distinction between underscores and spaces in page titles, so underscores will display as spaces.
Lowercase first letter
The MediaWiki software is configured to transform the first letter to uppercase, so no page title can start with a lowercase letter.