Why Are Roman Numerals Used in Labeling Cartesian Sections?

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dunno if this is an easy or hard question but can anyone answer this? why do we use roman numerals to label cartsian (i can't spell) sections and other things? is it becasue they have no place value?
 
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Convention. Roman numerals certainly make it easy to distinguish the numbers refer to a quadrant, don't they? :smile:
 

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