A Post-It Note is a type of adhesive note that was invented in 1968 by 3M. It is typically used as a reminder or to leave a message for someone. The term 'Post-It Note' is often used as a generic term for any type of adhesive note, but the original Post-It Note was created by 3M. The crossword solution for the term Post-It Note, E.G. is MEMO, which is an acronym for 'message to everyone'. A MEMO is a written communication that is typically used within an organization to provide information or instructions.