The Roman numeral XVIII is the representation of the number 18, that is, it is the symbolization of the number 18. Widely used by the Roman Empire, this system of numbers or numerals was created in Ancient Rome, in turn this style of numbering was never used widely. worldwide.
The style seen these days is called “modern use” as the Roman numerals have undergone many changes since their inception.
Roman numerals are widely used these days in chapters and pages of books, counting centuries (dates) in the names of people important to the history of the world, such as popes and kings, and also to indicate the time on the clock.
And this Roman numeral XVIII is often used to represent the eighteenth century (18th century) –> Brazil “século XVIII“.