 A payline is a line (straight or zig-zagged) that crosses one symbol on each reel of a slot machine, or the combination of symbols on the slot machine reels that the player is paid out for if he has made a bet on that combination.To be winning, any combination on the reels must have at least two identical symbols in a row, and the first one must occur on the first reel unless otherwise stated.In any other case, the combination doesn't pay out.