iscus

Could you clarify what you mean by "iscus"? There is no widely recognized topic by that exact name in major reference works, so I’m not sure which subject you want covered. It could be a misspelling or transliteration of another term, a fictional or brand name, a surname, or a very niche term in a specialized field. If you provide context—such as the field (anatomy, biology, linguistics, fiction, etc.), the region or language, or the source where you encountered it—I can draft a concise, neutral wiki-style article (under 300 words) tailored to that meaning.