Z OS

operating system from IBM. It is the new name for the existing mainframe system OS/390, combining MVS and UNIX System Services (a mainframe implementation of Unix, formerly known as MVS Open Edition.)

(In the same December 2001 rebrand:

S/390 became zSeries, the "z" standing for "zero down-time";
AS/400 became iSeries and in April 2003 i5, but OS/400 remained OS/400, rather than becoming "i/OS";
RS/6000 became pSeries and in July 2004 p5, the "p" standing for "performance", but AIX remained AIX, rather than becoming "p/OS";
Netfinity became xSeries.)


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