| Acronym | Definition |
|---|
| HDOS➣Hot Dog On A Stick (Enterprises) |
| HDOS➣Hughes Danbury Optical Systems |
| HDOS➣Heath Disk Operating System (Heathkit 8-bit computer) |
| HDOS➣Halt Die Ohren Steif (German: Keep Your Chin Up) |
| HDOS➣HTTP (Hypertext Transfer Protocol) Denial of Service (cyber attack) |