XVIII

XVIII, written in uppercase Roman numerals, represents the number 18. It is formed as X (10) plus VIII (8) and is used to denote the eighteenth item in a sequence, such as chapter XVIII, volume XVIII, or edition XVIII of a work.

In historical dating, XVIII is used to refer to the eighteenth century, the period from 1701 to 1800. The ordinal form appears in various contexts to mark centuries, decades, or series that are enumerated in Roman numerals.

There have been notable uses of the regnal and ecclesiastical numbers with XVIII, including Louis XVIII, who was King of France, and John XVIII, a pope. These examples illustrate how XVIII is employed to distinguish rulers or leaders who share a name but belong to different periods.

Beyond people and dates, XVIII is widely used as an ordinal label in catalogs, publications, and media. It can designate an edition, volume, or movement within a larger work, as well as a numbering convention in music, literature, or science.

Overall, XVIII functions as a versatile symbol for order and sequence, most commonly signifying the number 18 in Roman numerals and appearing in various historical, cultural, and scholarly contexts.