| Abbreviation | Definition |
|---|---|
| YLD | Young Lawyers Division |
| YLD | Young Lawyers Division (WSBA) American Association of Law Libraries |
| YLJ | Yale Law Journal |
| YLN | Yantzejiang Legal Network |
| YLP | Young Legal Professionals |
| YLS | Young Lawyer Section |
| YM | Young Male |
| YM | Youth Management |
| YNG | Young |
| YNYB | York North Yorkshire branch |
| YO | Youth Outreach |
| YPA | Youth Parole Authority |
| YPB | Yonkers Police Bike Patrol |
| YPD | Yonkers Police Department |
| YPD | Youngstown Police Department |
| YPD | Yuma Police Department |
| YT | Young Thug |
| ZAP | Zero Armed Perpetrators |
| ZD | Zero Dignity |
| ZGO | Zambada- Garcia drug Organization |