When Roman numerals are used on a clock face, why is the number 4 usually written as IIII rather than IV? Are there any other instances where IIII is used in favour of IV?

Question

When Roman numerals are used on a clock face, why is the number 4 usually written as IIII rather than IV? Are there any other instances where IIII is used in favour of IV?

In: Other

Answer 1

Someone once told me it was to differentiate between 4 and 6, but that has never made any sense to me