$  perl6 -e 'say VII * 2'
  ===SORRY!=== Error while compiling -e
  Two terms in a row
  at -e:1
  ------> say VII *⏏ 2
     expecting any of:
         infix
         infix stopper
         postfix
         statement end
         statement modifier
         statement modifier loop

EDIT: One should use https://en.wikipedia.org/wiki/Numerals_in_Unicode#Roman_nume...