Finneillä
Finneillä is a term that has seen some usage in informal discussions, particularly online, to refer to the fins or fin-like appendages of various creatures, real or imagined. It is not a formally recognized biological or scientific term. The word itself appears to be a colloquial or playful variation of the word "fins."
The context in which "finneillä" might appear could vary. For instance, it could be used by enthusiasts
Less commonly, it might be used humorously or informally when discussing real aquatic animals. For example,