ARABIC Function /text/scalc/01/func_arabic.xhp
ARABIC function text functions;convert roman numbers

ARABIC

Returns the numeric value corresponding to a Roman number expressed as text.
The largest Roman number that can be converted is MMMCMXCIX (or one of its simplified versions), which is equivalent to 3999. ARABIC(Text) Text: text representing a Roman number. =ARABIC("MXIV") returns the numeric value 1014. =ARABIC("MMII") returns the numeric value 2002. =ARABIC("") returns 0.
ARABIC wiki page.