Submissions series are often referred to as ‘chains.’ The problem with this metaphor is it’s a straight line in one direction.
As BJJ coach Chris Haueter says, in combination attacks there is a point where two positions exist at the same time. I would add to this, within every connecting position are a new set of possibilities.
So, I suggest instead of chain, the tetrahedron, or more accurately a series of connecting tetrahedrons. This humble shape symbolizes the several or more options in a given position, connecting to several more options, connecting to several more…and so on and so forth…
If I haven’t made it clear, a tedtrahedron is a connecting series of triangles that form pyramid (think Dungeons and Dragon die). Another metaphor here could be the Buckminster Fuller geodesic dome. The biggest thing is to think three-dimensionional shapes made up of an interlocking series of multiple possibilities.
Lastly, as with methods don’t get caught up on the metaphor. It’s what the metaphor respresents that’s important.