CDXC

CDXC is the Roman numeral representation of the number 490. In this notation, CD equals 400 and XC equals 90, and their sum yields 490. The numeral is part of the larger system of Roman numerals, which combines symbols for units, tens, and hundreds to express values.

In historical usage, CDXC may be used to indicate a year, such as 490 CE (or AD 490) or 490 BCE, depending on the era being referenced. It can also appear in inscriptions, monuments, manuscripts, or other dated artifacts where Roman numerals are employed for numbering and dating. Beyond dating, Roman numerals like CDXC are sometimes found in chapter headings, outlines, clock faces, or decorative contexts where a classical aesthetic is desired.

In modern contexts, CDXC may also function as an alphanumeric code or designation, appearing in catalogs, product model numbers, event identifiers, or file naming schemes. In such cases, the sequence of letters and numbers is used primarily for labeling and organization, and its numeric value is incidental to its function as an identifier. CDXC thus serves both a historical numeral role and a flexible modern labeling convention.