What term describes a braid that has two strands each crossing over and adding hair from the sides?

The correct term for a braid that has two strands each crossing over and adding hair from the sides is the fishtail braid. This style is characterized by its unique technique where the hair is divided into two sections, and small pieces are taken from each side and crossed over to the opposing section. This intertwining process creates a distinct layered appearance that resembles the scales of a fish, hence the name "fishtail."

The fishtail braid can be particularly effective for adding texture to the hair and showcases an intricate design that is popular in various styles. The method of crossing and adding hair from the sides is what differentiates it from other braiding techniques, emphasizing the importance of precision and skill in achieving the desired look.