Odds with a plus sign are underdog bets. Plus odds tell you how much profit you will get on aR$100 bet. AR$100 bet with +200 odds nets you $200 profit plus your originalR$100 bet. If you betR$20, you would profitR$40. For the rare even money odds, those can be listed as -100, +100 or EV.
The + and - are put in front of odds or lines, indicating the favorites and underdogs. The favorites will be marked with a minus sign, whereas underdogs have the plus sign. This is the case for all types of bets, including moneylines and point spreads.