CXXI

CXXI is the Roman numeral for the number 121. It is formed by adding the values of its component symbols: C equals 100, XX equals 20, and I equals 1. This makes CXXI the standard additive form for 121, with no subtractive notation involved.

In practice, CXXI appears in contexts where Roman numerals are used, such as inscriptions, numbered lists, chapter headings, or monarch and ruler designations. It is also used to denote the year in historical documents written in the Roman numeral style; for example, the year 121 CE would be written as CXXI CE.

Historically, the year 121 CE falls within the reign of Emperor Hadrian, who ruled from 117 to 138 CE. The use of CXXI in dating reflects the broader Roman numeral system used throughout the ancient world and in various modern settings that adopt Roman numerals for stylistic or traditional purposes.

Beyond its numerical value, CXXI may appear in product codes, model numbers, or other labeling where a numeric identifier is required. In such contexts, its meaning is simply to denote the number 121 within the applicable numbering scheme.