Comment by yorwba

Unicode has codepoints for roman numerals 1 through 12 and then the base symbols up to one hundred thousand (ↈ) which I just saw for the first time.

That Perl allows them in integer literals is strange, but also logical in a weird way. (Now I wonder what other number systems it supports.)

EDIT: Ok, so I installed perl6 (rakudo) just to test this out, and it apparently doesn't work out of the box. Pity.