Nookipedia:Signature policy

Signatures are used to sign one's message on a talk page or forum. To do so, four tidles ( ~ ) are used. If three tildes are placed, just the signature will be placed, and five will produce only the timestamp.

When to use
It is never acceptable to use one's signature on any page other than a talk or user page. Never on an article should you sign your work. Doing so will invoke a warning and the signature being removed. If this happens multiple times, a block will be issued. It is required that one signs comments on a talk page. If you come across an unsigned comment, then use the template to sign it. To find out who originally posted the comment, look through the talk pages history. If it was you who forgot to sign your comment, then you should sign with three tildes instead of four ; otherwise an incorrect timestamp will appear. If you saved the page and fix it a second later, then it is fine to sign normally, but not if another user has commented.

Images
Your signature may include an image, but it must not disrupt the line spacing. This means that it must be about 12px. No 50px images in a signature; it just ruins the page!

Links
Your signature must include a link to your userpage, and it is highly recommended that it links to your talk page. Other than that, it can link to any other page on the wiki. External links must not include any offensive material.

Information
Your signature must at least contain part of one's username.

Colors
It is acceptable to change the colors of your signature; just refrain from too bright colors. No white, cream, or neon colors, as those may be barely visible and difficult to read.

Examples
These signatures are examples for a user named ExampleUser.

Bad signatures
YO-MAMA!
 * You cannot tell who it is posting the comment.

ExampleUser
 * The image disrupts the line spacing and takes up an unusually large amount of space.

Good signatures
ExampleUser
 * The image does not change the line height.

ExampleUser
 * The font color is a dark color and is readable against the white background.