Does anyone remember that person who came up with the font where you would rotate and stack the zeros vertically, like the image below? I can't remember what it was called and am struggling to Google my way back.

This is funny. How do they represent, e.g.,

1001

? Still stacked? Seems like it would undermine some of the utility of the Hindu–Arabic numeral system. -- I hope someone turns up the link 🙂

@Shon Feder I forget. My hazy memory is that it was a tool for back of the envelope comparisons rather than precision calculations, and so only multiples of 1,000 were in the system, but I could be misremembering.

Interesting ligature.

That is an interesting idea and i have just confirmed that i too do not have the google-fu to find it.

Thanks @Andrew Heumann!