What is this yellow pin

And how do I make it stop/turn it off? Accidentally turned it on, not even sure how.
I google searched and google image searched w/the screenshot.
Thank you
whatIsThis

It’s most likely the Inset tool enabled:

You just have to change tool to the one you were using before.

Facepalm, just realized it. I had not used the menu before.
Drrr.
Thank you

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