Crossword Genius

CD and XL, for example (5,8)

Ross

I believe the answer is:

roman numerals

(Other definitions for roman numerals that I've seen before include "Eg, L, X, V, etc" , "Eg, I, V, X, L, C, D, M" , "Maybe MCC" , "V, X, L, for example" .)

I've seen this clue in The Guardian.
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