DCXXI

DCXXI is the Roman numeral for the integer 621. It is formed from the symbols D (500), C (100), XX (20), and I (1), which sum to 621. In Roman numeral usage, DCXXI would appear in contexts where numerals are used instead of Arabic digits, such as inscriptions or historical documents.

As a designation of time, DCXXI can denote the year 621 CE (AD) in the Julian or Gregorian calendar, or 621 BCE in the BCE era, with the exact interpretation depending on the calendar system in use. In historical studies, such dating helps locate events within the broader chronology of ancient or medieval periods.

Beyond dating, DCXXI may also serve as a simple numeric label in catalogs, lists, volumes, chapters, or serial identifiers. In these contexts, the numerals provide a compact, language-neutral way to enumerate items.

In modern references, DCXXI is primarily encountered in discussions of Roman numerals, historical dating practices, or inscriptions. It is not commonly used as an acronym with a standardized meaning unless a specific context assigns one.