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What is the math on the door? thank you
Its number is 153.

Roman numerals are the dial symbols of clocks and watches: I, II, III, IV (III I), V, VII, VIII, VII, X, X,, ...

Corresponding to Arabic numerals (that is, the internationally used numerals now), they are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12.