ústn

Could you clarify what you mean by "ústn"? The term does not correspond to a widely known place, organization, or concept in standard references. Knowing the intended context (geography, biology, acronym, cultural term, etc.) will help me write a precise, neutral wiki-style article under 300 words.

If you’d like, I can offer one of these options:

- a neutral, concise stub for a fictional or placeholder topic named "ústn" (under 300 words),

- a disambiguation-style note listing plausible interpretations,

- or a tailored article if you provide the specific context or domain.