Herringbone bead stitch forms a pattern where the beads join in a V shape similar to the central spine of a fish.
There are several different versions including flat herringbone bead stitch, tubular herringbone bead stitch (this tutorial), twisted tubular herringbone stitch and circular herringbone stitch.
Herringbone bead stitch is also sometimes known as Ndebele stitch after the African tribe that specializes in the stitch.