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Horizontal only
Only the I has a horizontal line of symmetry. Visualize folding PIZZA in half through the letters. Only the I would fold down perfectly on top of itself, so it has a horizontal line of symmetry.
Z
900000=CM with horizontal bar above it 90000=XC with horizontal bar above it 9000=MX with horizontal bar above X only 900=CM Therefore: ............_____..._ 999900=CMXCMXCM
(VIII) or VMMM but with an horizontal bar above the numeral V