A blank is a community card that has no obvious impact on hand strength.
Explanation. The term “blank” comes from the idea of a card that “marks no change” in perceived equities—it doesn’t improve most hands nor dramatically alter board texture. Players often refer to such cards as “rags” or “bricks.” Blanks are less likely to help drawing hands or pair the board. Recognizing blanks is useful for gauging opponent reactions and planning continuation bets postflop.