Rule 2 – Section 1 – Abbreviations
2-1-1 For brevity in the play rulings, the home team is H and the visiting team V.
2-1-2 Players of the team at bat are B1, B2, etc. The player who bats first in his half of an inning is designated B1. The second player to bat is B2, etc. Substitutes are S1, S2, etc. Runners are R1, R2, or R3, and R1 is the runner who has advanced farthest.
2-1-3 Fielding players are F1, F2, etc., in accordance with Diagram 1.