Correction: to get the crest accepted by Wikipedia, you don't need to have it on more than one page. In fact, for most fair use (i.e. copyrighted) images, chances are that they can only be fairly used on one page. What you need is a good reason to use it: the official logo of a company, institution, ... is acceptable if that is a usual way of identifying the institution. You can e.g. see the fair use rationale of the Nike logo here.