noun
participation prize; consolation prize for entering
A small gift or award given to all participants in a contest, race, or event, regardless of performance.
マラソン大会で、完走者全員に参加賞が配られた。
At the marathon, all finishers received a participation prize.
賞 is a general term for 'prize' or 'award'; 参加賞 specifically refers to a prize for participation.
Compound of 参加 (participation) and 賞 (prize).