The term Leaderboard is typically 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), items collected, or some other metric. Overall, leaderboards can provide an incentive for players to improve as they give many a sense of superiority or accomplishment.
Games like StarCraft 2, which is an RTS, 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 number of bosses killed, number of pets collected, and number of "achievements" earned.