Answer: UNIX
The answer UNIX has 88 possible clues. See the results below.
Possible Clues:
- Operating system developed by AT&T originally
- Certain operating system
- Operating system developed by Bell Labs
- Mac OS X is based on it
- Computer operating system since the '60s
- Popular computer operating system
- Bell Labs creation
- Operating system since the 1970s
- Computer operating system developed by Bell Labs
- Computer workstation operating system