| Y.E. | Yersinia Enterocolitica |
|---|---|
| Y2K | Year 2000 |
| YA | Yersinia arthritis |
| YAC | Yeast Artificial Chromosome |
| YADH | yeast alcohol dehydrogenase |
| YAG | Holmium:Yttrium-Aluminium-Garnet |
| YAG | Neodymium:yttrium-aluminum-garnet |
| YAG | Yttrium Aluminium Garnet |
| Yb | Ytterbium |
| Ybt | Yersiniabactin |