The Shortstop reference article from the English Wikipedia on 24-Apr-2004
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Shortstop

Shortstop, abbreviated SS, is the baseball fielding position between second and third base. It is also used to describe the player who plays the position (e.g., "Ozzie Smith was a shortstop"). Shortstop is the most dynamic position in baseball, because the player must be prepared to cover for the third baseman, second baseman, and the pitcher when any of those players moves.

See also Famous shortstops.