Roman Numerals are symbols ancient Romans used to represent numerical values. Similar to how "1" represents the concept of the one/the first number/singularity the symbol "I" represents the same. Roman numerals tend to follow a system where any given symbol can only be used up to a maximum 4 times when representing a specific number and each symbol represents a numerical unit. Depicting that unit multiple times represents higher values.
[table]
[tbody]
[tr]
[td] [/td]
[th] Thousands [/th]
[th] Hundreds [/th]
[th] Tens [/th]
[th] Unit [/th]
[/tr]
[tr]
[td] 1 [/td]
[td] M [/td]
[td] C [/td]
[td] X [/td]
[td] I [/td]
[/tr]
[tr]
[td] 2 [/td]
[td] MM [/td]
[td] CC [/td]
[td] XX [/td]
[td] II [/td]
[/tr]
[tr]
[td] 3 [/td]
[td] MMM [/td]
[td] CCC [/td]
[td] XXX [/td]
[td] III [/td]
[/tr]
[tr]
[td] 4 [/td]
[td] [/td]
[td] CD [/td]
[td] XL [/td]
[td] IV [/td]
[/tr]
[tr]
[td] 5 [/td]
[td] [/td]
[td] D [/td]
[td] L [/td]
[td] V [/td]
[/tr]
[tr]
[td] 6 [/td]
[td] [/td]
[td] DC [/td]
[td] LX [/td]
[td] VI [/td]
[/tr]
[tr]
[td] 7 [/td]
[td] [/td]
[td] DCC [/td]
[td] LXX [/td]
[td] VII [/td]
[/tr]
[tr]
[td] 8 [/td]
[td] [/td]
[td] DCCC [/td]
[td] LXXX [/td]
[td] VIII [/td]
[/tr]
[tr]
[td] 9 [/td]
[td] [/td]
[td] CM [/td]
[td] XC [/td]
[td] IX [/td]
[/tr]
[/tbody]
[/table]
The largest number that can be represented in this manner is 3,999 which would be represented as MMMCMXCIX.