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QED

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QED /ˌkjuːˌiːˈdiː/ abbreviation
QED
/ˌkjuːˌiːˈdiː/
abbreviation
Britannica Dictionary definition of QED
used to say that something (such as a particular fact or a logical statement) proves what you were trying to prove
QED is an abbreviation of the Latin phrase “quod erat demonstrandum,” /ˌkwɑːdˈeɚˌɑːtˌdɛmənˈstrændəm/ which means “which was to be demonstrated.”