Fishtail braid
A braid made with two strands, crossing thin pieces from the outside of each, like a fish's bones.
Also: herringbone braid
A fishtail braid uses only two sections. A thin piece is taken from the outer edge of one section and crossed over to join the other, and then the same is done from the other side, again and again. The result is a flat, finely woven pattern like a fish skeleton or herringbone cloth. It takes longer than a three-strand braid but holds well. Pulling the edges loose gives the soft, messy version popular at weddings.