That's Maths is a blog on mathematics in everyday life and history, covering Fibonacci patterns, number puzzles and math in music.
HN links it for accessible math history and nature posts; one commenter faults its rollercoaster piece for omitting Euler spirals and clothoids.
Wikipedia has plenty of citations to classical Rome.
Colosseum gate 44: XLIIII (not, for whatever reason, XLIV, or XXXXIIII)
18th legion: XIIX
22nd legion: IIXX
There was evidently not a strict standard.
(Note also that the symbols we use for high values, D and M, weren't really what the Romans used. You can see Roman abaci with columns labeled with place values: https://en.wikipedia.org/wiki/File:RomanAbacusRecon.jpg https://thatsmaths.com/2019/07/04/what-did-the-romans-ever-do-for-maths/
Those look the same; I don't know whether the one is a replica of the other or whether the form was just that standardized. But the columns are plainly labeled as, in ascending order, ϴ, I, X, C, ∞, ((|)), (((|))), and |X|.
I speculate that ∞ is a fancy way of writing (|); I believe our M descends from Roman (|) and our D from Roman |). )
Guy writes 10 bazillion sub-lit-crit words on rollercoasters, fails to mention Euler spirals and clothoids, where the beauty is, where maths guides and protects meat. A depressing lack of curiosity by the author.
https://thatsmaths.com/2014/04/10/rollercoaster-loops/
Wikipedia says the Trinity test was 20 kilotons. With Fermi estimating 10 kt, he was off by a factor of only two.
Of course Taylor got an estimate within 2 as well, using photographs published in Life magazine.
https://thatsmaths.com/2014/09/18/how-big-was-the-bomb/
This analysis can also be expanded to the complex numbers yielding "power tower fractals" aka "tetration fractals".
http://paulbourke.net/fractals/tetration/
https://thatsmaths.com/2016/04/14/the-power-tower-fractal/
Plants may not have a concept of numbers or math, but they seem to follow mathematical patterns regardless.
https://thatsmaths.com/2014/06/05/sunflowers-and-fibonacci-models-of-efficiency/
It's why arithmetical calculation was a role one had. They used an abacus for the calculation of complex sums.
https://thatsmaths.com/2019/07/04/what-did-the-romans-ever-do-for-maths/