@PamR You have a great answer to your test in my opinion. Definitely not a Cud as it doesn’t touch the rim.
Did you check if it's listed on Cuds o Coins/Broken Die Errors, "FYI it's a Die Chip and there errors not a varieties. Lincoln Cent Die Breaks Called “BIE” : Cuds on Coins (cuds-on-coins.com)
This is the one gifted to me…. The others look different yes. I guess it can be look at in two ways. The above resembles an “I” instead of a chip. Gifted from Mountain Man.
Not just that - you're a good learner! Many people have come and gone... some get frustrated. But only a few truly come to understand and appreciate what they are looking for/at as quickly as you!