Roman numerals are shaped like they are because they are the easiest shapes to carve into wood and stone.
I
V
X
L
C (should be more square like [ )
M
These shapes are clearly different yet easy to write.
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The Roman numeral for 0.5 or 1/2 is shaped like the letter S and its Latin name is 'semis' which means a half.
The roman numerals for 987 looks like this CMLXXXVII
20 is Arabic Numerals XX is Roman Numerals.
The Roman numerals are XLV.
You write 1533 in roman numerals like this: MDXXXIII