Is Unix the first operating system?
In 1972-1973 the system was rewritten in the programming language C, an unusual step that was visionary: due to this decision, Unix was the first widely-used operating system that could switch from and outlive its original hardware.
What is the full meaning of Unix?
What does UNIX mean? … UNICS stands for UNiplexed Information and Computing System, which is a popular operating system developed at Bell Labs in the early 1970s. The name was intended as a pun on an earlier system called “Multics” (Multiplexed Information and Computing Service).