Funny that the first post sticks out from the rest (a digital project vs. the physical ones). Notably it's more 3x3 a lot of the time. I wonder if the creator also felt like they had to make use of all the 3 pixels of horizontal space for some of these characters. The lowercase "l" is what I'd be using for a "1", with my lowercase "l" being 2 pixels wide, for instance.