CDXXII

CDXXII is the Roman numeral notation for the number 422. In this representation, CD equals 400, XX equals 20, and II equals 2, giving 400 + 20 + 2 = 422.

Roman numerals were widely used in ancient Rome and continued in various forms through the Middle Ages and into modern times for inscriptions, dates, and enumerations. As a year designation, CDXXII would correspond to AD 422 (Anno Domini) or CE 422, depending on the dating system employed.

Formation and rules: The subtractive principle places smaller values before larger ones to indicate subtraction, as CD (500 − 100) equals 400. The remaining XXII adds 20 and 2. The notation does not require a separate symbol for 400; instead, it uses CD. CDXXII uses only the basic symbols C, D, X, and I.

Usage: In contemporary writing, Roman numerals like CDXXII appear on some historical monuments, clock faces, outlines of monarch reigns, film or book chapters, or in reference to centuries and years in academic works. However, for most practical purposes, decimal numerals are used.

Variations: There is no single Unicode symbol for CDXXII; it would be represented by the sequence of letters "CDXXII" in plain text. In some contexts, older inscriptions may not strictly follow modern subtractive rules.