The term leaderboard is often used in the video gaming industry to signify rank among people who play various titles. Players can be ranked against other players based on their number of kills (most common), collected items, or some other metrics. Overall, leaderboards can incentivize players to improve as they give many a sense of superiority or accomplishment.
RTS games like StarCraft 2 have leaderboards for ranking players based on how many games they have won. Games like Call of Duty, a first-person shooter, have leaderboards for ranking players based on how many kills they have achieved during each match. Other games, like World of Warcraft, an MMORPG, have leaderboards for many categories, including the number of bosses killed, the number of pets collected, and the number of "achievements" earned.