The minus symbol always represents the favorite team, while the plus symbol always represents the underdog team. For example, if a point spread lists as -7, that means that 7 points favor the favorite team. When the point spread lists as +7, that means that the underdog team might lose by 7 points. If you put a bet on the favorite team, they must win by more than the number of points in the point spread in order for you to win your bet. If you bet on the underdog team, they must either lose by less than the number of points in the point spread, or they must win the game outright.