How to use roman numerals<br>Understand the concept of roman numerals. Roman numerals use fewer symbols than the number system you are used to. I is the number 1 (one), v is 5 (five), and x is 10 (ten), for example.
Roman numerals are the main numbering system in the world.
( z1 system :instrument-of ( z2 number ) :mod ( z3 main ) :location ( z4 world ) :domain ( z5 numeral :mod ( z6 country :name ( z7 name :op "Roman" :op "Empire" ) ) ) )