To prevent the breaking of talk pages or where ever else signatures are used, signatures should abide by these rules.
The purpose of a signature is to quickly identify your comments when made on pages that ask for them. They are customizable by font, color, size, and even images.
How to sign
Adding your user name to the end of a comment is accepted. To do this:
When the page is saved, your custom signature along with the date and time will be saved on the page.
Anonymous users are required to sign properly as well. The signing of a comment will include an IP address, IP talk page, and time the comment was made.
The name in the signature should be one that is clearly recognizable, readable, does not use uncommon font. Uncommon fonts cannot be displayed correctly on some computers. The text should also be readily compared to the user account name. A shortening or abbreviation of a name is fine, as long as other users accept this as your signature. If asked to change it, please do so if given good reasons.
The image, if one is used in a signature, should not be more than 19 pixels tall (#x19).