I have looked at a lot of books for agreement between them on the names of common shields.
Some writers will agree on what to call some shields, but by in large I have not found a lot of agreement between writers.
As to the Uncle Henry signature shield, I have only heard it called an "Uncle Henry Shield."
Bernard Levine in LG4 shows only 3 types of shields, the crest, gimp & bar shield.
The following is a quote defining the shield: "A decorative escutcheon, usually of metal, inlaid in a knife’s handle. There are hundreds of varieties, but most are variations of the bar, the crest and the gimp.”
The best chart I can find is in a book by Roy Ritchie & Ron Stewart.
I would agree with the basics of the chart but the last 2 examples in the oval column are commonly referred to as gimp shields by other writers.
They don’t even have a category for the gimp shields.
If I were working from their chart I would add a column for Gimp shields and edit the oval column to include oval & circle.
There are many beautiful old shields that are very intricate in design that do not fit easily into these simple categories.
I hope this is helpful.