Board texture
How much a board's suits and connectivity let hands improve, ranging from wet (draw-heavy) to dry (almost nothing beyond a made hand is live).
Texture comes down to two things: what suits are showing and how close together the ranks sit. A monotone board (three of one suit) or a two-tone one puts a flush in play; a rainbow board removes flushes entirely. Ranks bunched close together open up straight draws in both directions; ranks spread wide, or a paired board with few distinct ranks, close most of them off. A wet board needs bigger value bets and more protection because so many calling hands have real outs; a dry board lets smaller bets get believed, since almost nothing beyond what is already made is drawing.