Where are places that are using Roman numerals that are used today?

Answer 1

Although the Hindu-Arabic system is the dominant numeral system throughout the world today, Roman numerals are still used in some parts of the world, although not in any computational sense. They are used merely as a traditional form of notation.

Roman numerals are sometimes used to indicate a particular year or month, a person's lineage and other ordinal linguistics for first, second, third, etc, or to number the preface pages in a book. Roman numerals are also found on modern analogue clock faces, mostly for aesthetic appeal. Many sciences including astronomy, chemistry and seismology traditionally use Roman numerals for various purposes, such as numbering a planet's moons, and to denote the groups of the Periodic Table.

Roman numerals were also used to indicate the year in a copyright notice, particularly in film and TV productions. This was originally done to obfuscate the year of production, making old films appear newer than they actually were (unless you knew how to interpret the Roman numerals). However, the purpose of having a notice is to give notice, not to obfuscate that notice, thus most film and TV production companies have reverted to the standard Hindu-Arabic numerals to indicate the year of copyright.