What is this weird icon next to nodes parameters?

274698-capture.png

What does this icon mean and why is it here ?
It doesn’t seem to do anything and disappear when I click on it.
There is no tooltip and I couldn’t find anything in the doc, I’m lost here @.@

It indicates that this variable is watched. Blueprint Debugging Example | Unreal Engine Documentation

Thank you, that’s what I was searching :smiley: