LXXII

LXXII is the Roman numeral for the number 72. It is formed from L (50) plus XX (20) and II (2), yielding 50 + 20 + 2 = 72. As a numeral, it is used in contexts where Roman numerals appear, such as outlines, catalogs, or historical dating.

In practical terms, LXXII can designate the seventy-second item in a sequence, the year 72 in a given era, or a chapter or volume labeled with Roman numerals. When used for dating, the precise meaning of LXXII depends on the chronological framework in use; it could refer to the year 72 CE, 72 BCE, or another era if abbreviated in a specific system.

Mathematically, 72 factors as 2^3 × 3^2, making it a composite number with multiple divisors. In geometry and related discussions, 72 degrees is the central angle associated with a regular pentagon, a fact that appears in explanations of pentagonal symmetry and related tilings.

In modern usage, LXXII mainly appears in scholarly, archival, or cataloging contexts that rely on Roman numerals. Outside of such contexts, the number is typically expressed in Arabic numerals (72). The notation remains a conventional tool for marking sequences, editions, and historical dates in printed works and records.