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This could be a hologram/document that guarantees that the athlete, celebrity, or item being purchased is claimed to be authentic.
Autographs obtained in person or by other third parties may be accompanied by a Sports Possessions Certificate of Authenticity and it guaranteed to be 100% authentic.
There are many authentication providers whose certificate may accompany your item, most notable: PSA/DNA, (JSA) James Spence, Beckett, Schwartz Sports, MAB, and Ohio Sports Group.