thumb|300px|Cladograms B and C contain polytomies, where more than one branch descends from a single node.
thumb|300px|Cladograms B and C contain polytomies, where more than one branch descends from a single node.
An internal node of a phylogenetic tree is described as a polytomy or multifurcation if (i) it is in a rooted tree and is linked to three or more child subtrees or (ii) it is in an unrooted tree and is attached to four or more branches.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).