There are no "joined" Linux and Windows operating systems, so there is no name for them.
Two operating systems are; Windows, and Linux.
Windows is a family of operating systems. Linux is a kernel upon which operating systems are built.
Windows, Mac, and Linux
It would seem that when comparing Linux, Macintosh and Windows operating systems, Linux has the advantage. However, most programs and applications that are in high demand are usually written for Windows operating systems.
Windows / Linux..
CimTrak is supported on multiple Windows, Linux, Unix, and Macintosh operating systems
Windows, mac, linux
UNIX, Microsoft Windows, and Linux ARE network operating systems.
If by computer systems you mean operating systems, then: 1) Windows 2) Macintosh 3) Linux
linux, windows, mac OS x,
Windows, Linux, Mac OS X
these are an examples of operating system - Windows - Linux - Unix - Mac OS