Tyys
Tyys is a term that can refer to several different concepts depending on the context. One prominent meaning of tyys relates to the Finnish word for "night." In this sense, tyys is used to denote the period of darkness between sunset and sunrise.
Another usage of tyys can be found in certain fictional universes, particularly in games or fantasy literature.
Additionally, tyys could potentially be a misspelling or a variant of another word, depending on the language