From Nick Tylwalk,
Your Guide to Sports Cards.
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Definition: A general term used to describe the number of autographed cards, memorabilia cards and - depending on the product - rookie cards in a box of sports cards. Can also be used as a verb.

Examples:

Noun: From what I understand, you can expect four hits in every box of those baseball cards.

Verb: I really wanted a card of the top quarterback, but I opened packs all day and didn't hit any of his rookies.