CCCIX

CCCIX is the Roman numeral for the number 309. It is formed by adding CCC (300) to IX (9), yielding 309.

In ancient and medieval contexts, Roman numerals were used to denote dates, chapters, and enumerations on inscriptions and monuments. In modern settings, CCCIX may appear on clock faces, monuments, or in dated inscriptions to indicate the year 309 CE, or as a numeric marker in lists and other ordered sequences.

Beyond its numeric value, CCCIX can function as a code or designation in catalogs, product identifiers, or fictional works, where its meaning is primarily as a stylized numeral. It does not carry a meaning beyond representing the value 309 within the Roman numeral system.