What does 5c stand for?

The Iphone 5C is Iphone 5Colorful 5c can also stand for the number 500 ("c" is the Roman numeral for 100) or for 5 degrees Celsius (centigrade)

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"5c" can not stand for any Roman numerals for three reasons. For a start you do not mix Arabic and Roman numerals like that - it would be nonsensical. Secondly, the Roman for 100 is capital "C", but thirdly, in the Roman scale, 5 is V, 50 is L and 500 is D. The 'C' is also capital for degrees Celsius / Centigrade.