Topical Subset

From BaseballCardPedia.com

Topical subset: Any collection of cards that follow some sort of theme, but might cover all brands, players, even sports. Fairly common topics include cards showing players with their kids, players playing other sports, players with cameras, star players on other player's cards (e.g. 1992-'93 Fleer Ultra Harold Miner, which shows Michael Jordan defending his shot), players from your hometown, players signing autographs (great to get autographed), or father-son-grandson links like the Boone's, Bonds', and Griffey's in baseball, the Howe's in hockey and the Barry's in basketball.