I need help naming a thing...

Imagine you have layers that stack vertically, with a one to one relationship, the output of one is fed up the stack and each component takes in, modifies, and passes along.

We call this a "Stack"

What would be a good word for the horizontal equivalent, that is one item sits on top of two or more layers and routes and/or merges between them. Preferably something with a conceptual connection to the idea of a stack.