apostrophus

noun
apos·​tro·​phus | \-fəs\
plural apostrophi\ -​ˌfī \

Definition of apostrophus 

2 : a symbol that resembles a backwards letter C and that was used in the ancient Roman number system in combination with the symbol I to represent 500

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History and Etymology for apostrophus

Late Latin

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something that serves to warn or remind

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