The end of a branch is called a node. If a node features two (or more) branches below it, this is an instance of a branching node. In contrast, if a node features a single branch below it then this is an instance of a non-branching node. (Carnie, 2006, p. 119)
Carnie, A. (2006). Syntax: A generative introduction. John Wiley & Sons.
Lai, I. S. (1998). The grammar and acquisition of Secwepemctsín independent pronouns. [Master’s thesis, The University of British Columbia].