Robert P. Munafo, 2010 Sep 19.
An inexact name for one of the filaments, especially a primary filament, that meet at a branch point.
For example, in the R2.1/3 article there are two branches in the upper part of the image. They are R2F(1/3B1) (extending towards the upper-left) and R2F(1/3B2) (extending toards the upper-right). The third part of that three-way branching structure (leading down towards the large mu-atoms) might also be called a "branch".
To give another example, the first figure in the R2.2/5a article has four branches (three large, and one somewhat smaller) in the upper-left part of the image.
From the Mandelbrot Set Glossary and Encyclopedia, by Robert Munafo, (c) 1987-2017. Mu-ency index
This page was written in the "embarrassingly readable" markup language RHTF, and was last updated on 2017 Feb 02. s.11