The Roman numerals used for fractions are not in 'modern use', but they are Roman representations of numerals:
•     = 1/12
••    = 1/6  (alternatively, :  )
•••   = 1/4  (alternatively, ∴  )
••••  = 1/3  (alternatively, :: )     
••••• = 5/12 (alternatively, :·:)
S     = 1/2
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I     = 1
II    = 2
III   = 3
IIII  = 4    <- a non-standard, yet alternate form
V     = 5
X     = 10
XIX   = 19
XX    = 20
XXX   = 30
L     = 50
C     = 100
CXC   = 190
CC    = 200
CCC   = 300
D     = 500
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A system of representing large numbers is the use of the overline to represent a multiple of 1000. For even larger numbers a vertical line was placed before and after the numeral to represent an additional multiplier of 100. (The use of the underline here is used in place of the overline.)
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M     = 1000    alternatively, I 
MCM   = 1900
MM    = 2000    alternatively, II
MMM   = 3000    alternatively, III
V     = 5000
X     = 10000
XIX   = 19000
XX    = 20000
XXX   = 30000
L     = 50000
C     = 100000  alternatively, |I|  
CXC   = 190000
CC    = 200000  alternatively, |II| 
CCC   = 300000  alternatively, |III|
D     = 500000  alternatively, |V|  
M     = 1000000 alternatively, |X|  
MCM   = 1900000 alternatively, |XIX|
MM    = 2000000 alternatively, |XX| 
MMM   = 3000000 alternatively, |XXX|
|L|   = 5000000
|C|   = 10000000
|CXC| = 19000000
|CC|  = 20000000
|CCC| = 30000000
|D|   = 50000000
|M|   = 100000000
|MCM| = 190000000
|MM|  = 200000000
|MMM| = 300000000

Given the number of characters used in its representation, |MMM| is the largest palindrome in the representation of modern Roman numerals. 

Posted by Dej Mar on 2015-04-07 15:43:31