SV stands for save. If a closer pitches the final inning with his/her team in the lead and does not let the other team win, s/he earns a save.
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It means Saves, like if say Mariano Rivera (closer) was pitching and there was two outs in the bottom of the ninth and Rivera strikes the batter out than that would be considered a save.
sv stands for "save" or "save percentage" depending on where it is used. This is a statistic tracked for goalies. a save is recorded each time a goalie stops the puck from entering his net.