@John1 - I am pretty sure that was coop (though I don't know if it related to BIE's) but he used to write on my posts that a lot of what we call errors are Die Events such as Greasers, Abraded Dies, and actual Die chips.
Errors were the One-of-kind happening like: Broadstruck, clipped planchets, the Dual Denomination strikes) like the one that was posted with the dime), capped dies etc.
I had a bunch posts saved and categorized on my other computer (which died a couple of months ago) so I lost all of those documents. Actually, coop has that info in his YouTube videos.