Rule 2 – Section 13 – FIELDER
2-13-1 A fielder is any one of the nine players of the defensive team.
2-13-2 The players who play left field, right field and center field are outfielders.
2-13-3 The others are infielders.
2-13-4 The pitcher and catcher are the battery.
2-13-5 In the play rulings, a fielder is referred to as F1, F2, etc.