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.
P-S-Y
The three letters P-S-Y (without dashes) cannot appear in a page title or wiki page. All instances must be removed before a page can be saved.
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.