| Abbreviation | Definition |
|---|---|
| YAC | Yolo Atari Club |
| YBL | Yellow Brick Logo |
| YC | YoungCoders |
| YML | Why Markup Language |
| YML | Your Mac Life |
| YOL | Your Own Language |
| z/OS | OS/360 operating system version |
| ZA | Zero Administration |
| ZAGF | Zurich Administradora General de Fondos |
| ZAR | Zero Assumption Recovery |
| ZCS | Zero Code Suppression |
| ZCT | Zip Code Technology |
| ZD | Zero Defects |
| ZDA | Zero- Document Application |
| ZDC | Zike Data Classes |
| ZDG | Zope Developer's Guide |
| ZDNET | Ziff- Davis Network |
| ZDP | Zope Documentation Project |
| ZEN | Zero Effort Networking |
| ZEO | Zope Enterprise Objects |