n: non-negative integer
type: 0,1,2,3,or 4, defaults to 0
ROMAN returns the arabic number n as a roman numeral text.
If type is 0 or it is omitted, ROMAN returns classic roman numbers.
Type 1 is more concise than classic type, type 2 is more concise than type 1, and type 3 is more concise than type 2. Type 4 is a simplified type.
This function is Excel compatible.