Twine, plait and interlock are some terms used to describe the long hair design method of crossing or weaving three or more strands of hair, also known as a(n):

The term that encompasses the method of crossing or weaving three or more strands of hair is "braid." Braiding involves intertwining the strands in a specific manner to create a cohesive and decorative structure. In hairstyling, braids can take on many forms and styles, often incorporating various techniques and patterns to achieve both functional and aesthetic results. The terms twine and interlock refer to specific techniques within the broader category of braiding, highlighting the intricate nature of this skill.

While the other terms such as twist and plait are related to hair design, they refer to distinct styles or techniques. A twist generally involves two strands being twisted around each other rather than combined in a multi-strand pattern, and a plait specifically refers to a three-strand braid. However, the most inclusive and accurate term for the action described—crossing or weaving three or more strands—is indeed "braid."