Läpivirta
Läpivirta (from läpi "through" + virta "flow") is a Finnish noun describing throughflow or pass-through—the movement or transmission of something through a medium, system, or boundary. The exact sense depends on context, but the core idea is that an element can cross from one side to the other without being completely transformed or halted.
In hydrology and environmental science, läpivirta describes water or solutes moving through soil or porous media
In economics and business, läpivirta is used to describe price pass-through: how changes in costs, taxes, or
In engineering and signal processing, läpivirta can denote a direct or nearly unaltered signal path through