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what is the use of esc in computer
On computer keyboards, the Esc key is a key used to generate the escape character which when sent from the keyboard to a computer, is interpreted by software as stop.
where is the escape key located
The escape key is now generally placed at the top left corner of the keyboard, a convention dating at least to the original IBM PC keyboard.

Question: what was the original name of the key
Self-contained rewrite: what was the original name of the escape key