They're supposed to represent 149 in Roman numerals.
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CXLIX in roman numerals is 149.
CXLIX
In today's terms the given Roman numerals are equivalent to 149 in Hindu-Arabic numerals.
CXLIX C = 100 XL = 40 IX = 9
In todays terms: CXLIX but the Romans themselves probably simply wrote it out as ICL (150-1)