| Abbreviation | Definition |
|---|---|
| ATL | Atlanta Braves |
| AUBB | Aurora University BaseBall |
| AVBL | Apple Valley Baseball League |
| AVBL | Aston Valley Baseball League |
| AVG | batting AVeraGe |
| AVLBL | Amwell Valley Little Baseball League |
| AYB | Ashwaubenon Youth Baseball |
| AZBC | Arizona Baseball Club |
| AZBL | Arizona Baseball League |
| B | Baseball |
| B | Bats |
| BAAB | Brookwood Athletic Association for Baseball |
| BABA | Badger Amateur Baseball Association |
| BABL | Boston Amateur Baseball League |
| BAL | Baltimore Orioles |
| BALB | Billings American Legion Baseball |
| BAMM | Baseball Academy Of Mid Michigan |
| BARK | Baseball Aquatic Retrieval Korps |
| BASEC | Baseball and Softball |
| BASEC | Baseball And Softball Enhancement Center |