CXXVII

CXXVII is the Roman numeral for the decimal value 127. In this numeral system, C represents 100, XX represents 20, and VII represents 7, giving 100 + 20 + 7 = 127. The form CXXVII uses additive notation, with no subtractive pairs such as IV or IX.

In mathematics, 127 is notable as a prime number and as a Mersenne prime, since 2^7 − 1 equals 127. It is also the maximum value of a 7-bit unsigned binary integer, and in ASCII the decimal value 127 corresponds to the delete control code (DEL).

Historically, Roman numerals appear on inscriptions and in dated records. If used to denote a year, CXXVII would correspond to the year 127 CE (or AD) in the Julian calendar, a period within the early Roman Empire.

Today, Roman numerals continue to be used in specific contexts, such as clock faces, chapter or volume numbering in books, the design of monarchial regnal numbers, and other formal enumerations. In these contexts, CXXVII may appear as a sequence marker or label, standing in for the value 127.