XTH

Xth is a nonstandard orthographic form that attaches the English ordinal suffix th to the Roman numeral X. The standard English ordinal for ten is 10th, so Xth is uncommon and typically appears only in stylized or templated text rather than in formal writing.

Formation and usage. X denotes ten in Roman numerals, and Xth would be read as the tenth item in contexts that use Roman numerals for labeling. Editors usually prefer 10th for clarity. Xth can appear in headings, chapter labels, event names, or brand names that favor Roman numerals for aesthetic reasons. In many mathematical or technical contexts, however, the conventional notation is either n-th or x-th with a lowercase variable, rather than Xth.

Ambiguity and style. Because Xth combines an uppercase X with the th suffix, it can be read as a stylized label rather than a straightforward ordinal. In formal documents and most publications, 10th is preferred to avoid confusion.

Variations and related terms. The lowercase form x-th is commonly used when x represents a variable, especially in mathematical or programming contexts. Related concepts include the ordinal indicators 1st, 2nd, 3rd, and the broader idea of using Roman numerals for enumerated sections, chapters, or items when a stylistic choice governs the format.

See also: 10th, nth, x-th, ordinal indicators, Roman numerals.