inimsisestiku

Could you clarify what "inimsisestiku" refers to? The word appears to be Estonian and could relate to different concepts (for example, a psychological or philosophical notion of the inner self, a technical term in computing or data input, or a cultural/lultural studies concept). If you can provide a definition or the field in which this term is used, I can draft a concise, neutral wiki-style article (under 300 words) accordingly. If you’d like, I can also provide a general stub that outlines several plausible interpretations and notes uncertainty.