Penguin
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PS/2 was originally the name of a new range of IBM computers which were infamous for being the only IBM compatiable not to be IBM compatiable even though they were made by IBM!

In retrospect this was actually a good thing as then software became abstracted from the hardware which opened up increasing performance for PCs and scope for further evolution. For example in the GoodOldDays? your game may have been unplayable on a newer machine as it would be twice as fast if the processor was twice as fast...

Nowadays it is used to describe the connection for keyboards and mice. Keyboards and mice were originally plugged into bigger ports (XT/AT and serial respectively) and the PS/2 introduced the newer, smaller ports.

Now largely replaced by USB peripherals although GRUB (my version anyway) still needs a PS/2 keyboard to make selections which can be annoying on the occasion that I want to use Windows.