tenhitotsu
Tenhitotsu is a term found primarily in Japanese-language contexts as a coined word or proper name rather than a standard dictionary entry. There is no widely accepted definition in major Japanese dictionaries, and the meaning of the term, when it appears, depends on how it is written and the context in which it is used. In many cases, tenhitotsu is analyzed as a compound of elements that can imply numbers, but the combination has no fixed sense in ordinary Japanese.
Because it is uncommon outside of niche writing, tenhitotsu is typically encountered as a stylistic choice
Usage notes: The ambiguity surrounding tenhitotsu has led to its treatment as a creative or thematic device