puumalliin

I’m ready to write a neutral, concise wiki-style article about Puumalliin, but I can’t locate a widely recognized topic by that exact name. Could you clarify what Puumalliin refers to—whether it’s a place, a term in Finnish linguistics, a product, a concept in a specific field, or something else? If you can provide context or a source, I’ll draft a concise article under 300 words.