ANCESTRAL FILE NUMBER

As listed at Wikipedia, an Ancestral File number is a unique identifier for everyone who has a record in the Ancestral File format. AFNs are used as a genealogical indexing tool by the LDS Church. AFN's consist of four capital letters or numbers, a dash, and then two or three more capital letters or numbers. An AFN does not contain any vowels (A, E, I, O, U, or Y). An example is 1BS3-9X1. AFNs can be searched online at the LDS geneaology website, FamilySearch.