System 9

System 9 or System IX may refer to:

Computing

• IBM System z9, the mainframe line
• Plan 9 from Bell Labs, the operating system
• Mac OS 9, latest release of Classic Mac OS operating system
• OS-9, the Unix-like real time operating system
• SYSTEM POWER 9, line of power supplies by be quiet!

Other

• STS-9 (Space Transportation System-9), the Space Shuttle mission

See also

• Series 9
• OS9 (disambiguation)