Letters with rounded terminals are especially popular for public signage in a few Asian countries, e.g. Japan and Korea.
That is why Microsoft Windows has included such a rounded font for the Korean script: Gulim. On Windows, if you want to render a text with Latin letters with rounded ends, you can use Gulim for the normal text, coupled with Arial Round for the bold text.
On MacOS, there was a Hiragino Maru Gothic rounded font for Japanese (where also the Latin letters are rounded). I no longer use Apple computers, so I do not know whether the Hiragino fonts have remained the fonts provided for Japanese.
Now I want to see a rounded terminal (as in command-line apps, not terminals in letters.) Would I type in a circle? Sounds cool.