Roman numerals are numerals that replace the normal Arabic numerals. They use letters such as
I, V, X, L, C, D, and M. Each letter has a value and cannot be repeated more than 3 times. A bar over a roman numeral means it has been multiplied 1000 times so you don't have to write numbers that are like 20 numerals long.

A Roman number system that uses letters to replace numbers. ie. I II III IV V VI VII VIII IX X etc.

Roman numerals are a type of numerals that use the letters I, V, X, L, C,D, and M
They are used in ancient Rome way back before when Hindu Arabic numbers weren't even invented.

An Instagram group, consisting of 6 girls being dumb fucks.

Letters for when you don't feel like saying numbers

A hot girl who you have dated and are no longer with. (An X)