Not to my face, they don't
his students affectionally refer to him as "N-dot".I have heard that nickname before, but I am surprised to learn that it has gained some currency.
Update: Gzkn writes in the comments section, "As a regular Wikipedia editor (and reader of this blog), I've taken the liberty of removing the "N-dot" reference from the article, since it's not exactly backed up by reliable sources."
Update 2: Also from the comments section: "From an ec10 instructor who works for N-Dot, His students DO call him that, and they also chuckle when they walk past his car with the EC10 license plate. So, to the wikipedia editor, please, put it back in."