Unix version offered by Cray, ( CrayResearch, Inc.)
A version of the UNIX operating system adapted for CRAY computers.
Unicos (officially all-caps UNICOS) is the name of a range of Unix operating system variants developed by Cray for its supercomputers. Unicos is the successor of the Cray Operating System (COS). It provides network clustering and source code compatibility layers for some other Unixes.