What do you call a graph that’s almost an arborescence, but where the edges go in the opposite direction? That is, a directed graph with a center node, where every node has exactly one path to the center?
It might help to have a reason for naming this thing. I’m looking to describe the control structure used in a continuation passing architecture. If the structure is called a “romefuz”, we could say that continuation passing uses a call-romefuz rather than a call-stack.
I don’t know of a single-word term for the reverse of an arborescence, but I think it is good enough to just use “reverse arborescence”. (The Wikipedia entry provides citations for converse, transpose, and reverse, of which I think reverse sounds the best, but surely you could also pick either of the other two. Perhaps converse sounds a bit more rigorous; lay people are less likely to use it. But then, lay people wouldn’t really be talking about arborescences in the first place, would they?)