Is the 'th' in Roman numbers used as in a cardinal number?

There isn't a “th” in Roman numerals, and there isn't a “th” in cardinal numbers either. These are confusingly overlapping points. The “th” (or “st” or “nd” or…) marks the difference between ordinal and cardinal numbers (in English grammar, not the jargon use of “ordinal” and “cardinal” in mathematics). read more

In Spanish, “el siglo diecinueve” [the nineteenth century, literally the century nineteen] is written as “el siglo XIX” with small capitals. However, “XIX” only represents a cardinal used in place of an ordinal, because ordinals past ten or twelve take forms that most everyday speakers find challenging or unnecessarily complicated. read more

New Hart's Rules (p. 148-9) seem to restrict the use of Roman numbers to: - acts and scenes - chapters, appendices and volumes - monarchs and popes - American personal names So, I would also write 3rd Games. read more