CDLXVI

CDLXVI is a Roman numeral representing the number 466. It is composed of three parts: CD (400), LX (60), and VI (6). In this notation, the C before D indicates subtractive notation, where 100 is subtracted from 500 to yield 400. LX denotes 50 plus 10, and VI denotes 5 plus 1, so the full value is 400 + 60 + 6 = 466.

Roman numerals originated in ancient Rome and were widely used in Europe for many centuries in inscriptions, monuments, clocks, and the dating of events. Modern usage remains common in specific contexts, such as clock faces, outlines and book chapters, page numbering in prefaces, and ceremonial or decorative settings. The numeral CDLXVI is primarily encountered in historical or stylistic contexts rather than in everyday arithmetic.

In historical practice, there were variations in how numbers were written. Subtractive combinations like CD for 400 are standard in contemporary usage, but earlier or regional inscriptions sometimes employed additive forms, such as CCCC for 400, or other non-subtractive constructions. Today, subtractive notation is the prevailing convention in Roman numerals.

In summary, CDLXVI is the standard modern Roman numeral for 466, illustrating the combination of subtractive and additive elements that characterize the system. Its use today is largely confined to stylistic, historical, or ceremonial contexts rather than routine mathematical notation.