Template:Uncertain origin
This template is for pages containing text of an undefined origin, which is a violation of Project:Policy. It places a centered block of text with grey border and pink background and adds the page to Category:Pages with unsourced text. You are recommended to use the one parameter to provide a more specific reason why the page needs a cleanup. Copy and paste the following to use the template, then replace 'TEXT' with the specific reason:
{{uncertain origin|TEXT|link}}
The result will be as shown below with your text replacing the curly-braced parameter. If you omit '|link' then it will omit the comment pointing users to the talk page.
See also template:cn, a non-banner template to note that a citation is lacking for a particular piece of information, and template:cleanup, a banner template for pages that are in need of cleaning up for more general reasons.