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Clock
On analog clocks, the hours are usually indicated with arabic numerals as
1 2 3 4 5 6 7 8 9 10 11 12
or with roman numerals as
Ⅰ Ⅱ Ⅲ ⅡⅡ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Ⅹ Ⅺ Ⅻ
On a clock the number Ⅳ is almost always shown as ⅡⅡ.
Variants
Because roman numerals have no symbol for 0, you start with Ⅻ. With arabic numerals it could be otherwise.
Ⅻ ⅩⅠ Ⅰ Ⅹ ⅠⅠ Ⅸ Ⅲ Ⅷ ⅠⅠⅠⅠ Ⅶ Ⅵ Ⅴ
12 11 1 10 2 9 3 8 4 7 6 5
0 11 1 10 2 9 3 8 4 7 6 5 Roman Arabic Otherwise
After all, on a digital clock you get
00:00
with double zero, and that surprises apparently nobody.