pinnakatvusest

Could you confirm whether "pinnakatvusest" refers to a real Finnish term or a fictional/conceptual one? If you want, I can produce a neutral, concise wiki-style stub for either option. For a real-term entry, please share the domain or context (linguistics, geography, sociology, etc.). For a fictional entry, I can create an encyclopedia-style article detailing definition, etymology, usage, and examples.