> How do you print IX with yours?

You rotate XI 180 degrees.

In most serif typefaces, one of the glyphs is significantly thicker than the other, and they don't meet exactly at 50% height. If one rotates the letter X 180 degrees, it would look out of place.

https://upload.wikimedia.org/wikipedia/commons/e/e6/Capitali...

there is no XI in XVIIIII though

ah nvadr spells it out:

VIIIIX

https://news.ycombinator.com/item?id=39722131

No, because you need a 5th V for IV. Adding a V is more overhead than adding a I, and will give you 3 V's you have no use for.