Technology

• OS-X
  OS-X
  OS-X is a priority-based pre-emptive multitasking real-time embedded operating system designed for embedded Zilog Z80 systems with bank-switched memory...
  
  , an operating system for the Zilog Z80
• DC/OSx
  DC/OSx
  DC/OSx was an operating system for MIPS based systems developed by Pyramid Technology. It ran on its Nile series of SMP machines and was a port of AT&T System V Release 4 . DC/OSx was the first SMP implementation on Unix System V Release 4...
  
  , 1980s-era Unix operating system by Pyramid Technology

Other

• Kosciusko-Attala County Airport in Kosciusko, Mississippi
  Kosciusko, Mississippi
  Kosciusko is a city in Attala County, Mississippi, United States. The population was 7,372 at the 2000 census. It is the county seat of Attala County....
  
  , by IATA code
• OSX, a Brazilian shipbuilding company, part of the EBX Group
• Old Saxon
  Old Saxon
  Old Saxon, also known as Old Low German, is the earliest recorded form of Low German, documented from the 8th century until the 12th century, when it evolved into Middle Low German. It was spoken on the north-west coast of Germany and in the Netherlands by Saxon peoples...
  
  , an early form of Low German used until the 12th century, by ISO 639-3 language code