sætu

Could you specify what sense or context you mean by "sútu"? The term can refer to different things in different languages or fields (for example a place name, a surname, a linguistic term, or something else). If you can indicate the language or context, I can write a concise, neutral wiki-style article under 300 words. If you’d like, I can also produce a general stub that outlines multiple possible uses and notes the ambiguity.