What Are The Names For Styles Of The Digit One?

I see variations in the style of the digit one ("1") on coins (sometimes even within a Krause type) and I would like a terminology to discuss the variations. Is there a good resource for font questions like this?

One type is Roman, horizontal lines top and bottom. See the denomination in https://en.numista.com/catalogue/pieces74426.html .

Two other styles I call "old style" and "new style" (based on the years I've seen them used) but there must be standard names used by font historians.

The old has rounded serifs and the bottom isn't flat. The image below comes from https://en.numista.com/catalogue/pieces18190.html (Bavaria Pfenning 1816).


The new has straighter edges, usually with sharper corners. The image below comes from https://en.numista.com/catalogue/pieces96271.html (Appenzell Pfennig 1816).



I see these styles used in both years and denominations. (Note that the example I used for the Roman style uses the "old style" in the date.)

There are variations in other digits (open versus closed 4 for example), and there are significant variations in other number systems (such as Arabic digits), but currently I'm looking at the transition of styles for the digit one.