There is a fake etymology of the word mouse, which some claim is an acronym for "Manually Operated User Selection Equipment", but the device's name came from its resemblance to a mouse and was established very early on. The mouse was invented by Douglas Engelbart of Stanford Research Institute in 1963. It was also called the bug, but eventually this was dropped in favor of mouse. It is called a mouse primarily because the cord on early models resembled the rodent's tail, and also because the motion of the pointer on the screen can be mouse-like.
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