| Abbreviation | Definition |
|---|---|
| YJM | Yngwie J. Malmsteen |
| YMCMB | Young Money Cash Money Billionaires |
| YOC | Yalin Ongun Coskun, Turkish artist |
| YOC | Yoshkar-Ola City |
| YP | Yves Pelletier |
| YSY | Yong Shu Yang |
| YUL | Yul Brynner |
| ZIS | Zavod Imini Stalin |
| ZJS | Zigman Joseph Stephenson |
| ZM | Zhao Min |
| ZMJ | Zhao Mengjian |
| ZSD | Zygmunt S. Derewenda, Professor at UVA |
| ZSR | Z. Smith Reynolds |
| ZT | Zachary Taylor |
| ZVB | Zachary Van Brunt |
| ZYQ | Zhong Yuan Qigong |
| ZZ | Zhen Zhu (alternative spelling of Sun Tsu) |