<P> Mixed Roman and Hindu - Arabic numerals are sometimes used in numeric representations of dates (especially in formal letters and official documents, but also on tombstones). The month is written in Roman numerals, while the day is in Hindu - Arabic numerals: "14. VI. 1789" and "VI. 14.1789" both refer unambiguously to 14 June 1789 . </P> <P> Roman numerals are sometimes used to represent the days of the week in hours - of - operation signs displayed in windows or on doors of businesses, and also sometimes in railway and bus timetables . Monday, taken as the first day of the week, is represented by I. Sunday is represented by VII . The hours of operation signs are tables composed of two columns where the left column is the day of the week in Roman numerals and the right column is a range of hours of operation from starting time to closing time . In the example case (left), the business opens from 10 AM to 7 PM on weekdays, 10 AM to 5 PM on Saturdays and is closed on Sundays . Note that the listing uses 24 - hour time . </P> <P> Roman numerals may also be used for floor numbering . For instance, apartments in central Amsterdam are indicated as 138 - III, with both a Hindu - Arabic numeral (number of the block or house) and a Roman numeral (floor number). The apartment on the ground floor is indicated as' 138 - huis' . </P> <P> In Italy, where roads outside built - up areas have kilometre signs, major roads and motorways also mark 100 - metre subdivisionals, using Roman numerals from I to IX for the smaller intervals . The sign "IX 17" thus marks kilometre 17.9 . </P>

What does x with a line over it mean in roman numerals