Acronym |
Definition |
| MPR | Mandatory Play Rule |
| MSLA | Montrose Softball League Association |
| MSSL | Menifee Senior Softball League |
| MTBS | Miss Tampa Bay Softball |
| MVSA | Mounds View Softball Association |
| MYBS | Martinez Youth Baseball and Softball |
| MYBS | Mashpee Youth Baseball and Softball |
| MYSL | Middleborough Youth Softball League |
| NAGS | Northridge ASA Girls Softball |
| NBSA | Newton Baseball Softball Association |
| NCSA | National Club Softball Association |
| NCSL | North Cincy Softball League |
| NDSA | Naperville Diamonds Softball Association |
| NDSA | North Dakota Softball Association |
| NDSA | Newcastle District Softball Association |
| NGSA | Northbrook Girls Softball Association |
| NGSA | Northridge Girls' Softball Association |
| NGSA | Noblesville Girls Softball Association |
| NGSA | Northampton Girls Softball Association |
| No | Number |
| NPF | National Professional Fastpitch softball league |
| NSA | National Softball Assosition |
| NSA | National Softball Association |
| NSAD | National Softball Association for the Deaf |
| NSAD | National Softball Association of the Deaf |
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