X Marks The Spot
by shortarcflyer from LinuxQuestions.org on (#6KEJM)
I came across this article today and found it interesting. I know that it is old but thought I would share it anyway. It covers when "X" was "first" used in an UI and by whom.
https://medium.com/re-form/x-to-close-417936dfc0dc
https://medium.com/re-form/x-to-close-417936dfc0dc