What is this?

[TemporaryUser0101]

I was busy setting up a new worksheet in Excel when suddenly I noticed a purple symbol in the upper right hand corner of a cell. I have no idea how it got there but it showed my user name and a sentence telling you what to do to post. What is this?What is its purpose?Please note, I accidentally removed it before I had a chance to investigate its purpose?What other info can you provide regarding this?Thanks for trying to help this ancient old man!!! All help is greatly appreciatedI am running a Lenovo desktop 1T Hard drive and 1T memory Windows 10Microsoft 365 Office - homeThanks for trying

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