OS/360, officially known as IBM System/360 Operating System, is a discontinued batch processing operating system developed by IBM for their then-new System/360
industry-dominant IBM System/360 and IBM System/370 mainframe systems, and then through IBM Power Systems (AIX), IBMZ (z/OS and z/VSE), and x86 (Linux)
Linux on IBMZ or Linux on zSystems is the collective term for the Linux operating system compiled to run on IBM mainframes, especially IBMZ / IBMzSystems