Similar to a T-Junction, a Y-junction gets its name due to being shaped like the letter Y. At a Y-junction, a minor road joins a major road at an acute angle.
Y-junctions come in many forms, some that can be deceptive and unexpected. Y-junctions, as with any other type of junctions can be ‘open’ (easy to see traffic on the opposing road) or ‘closed’ (a blind junction obscured by foliage, fences etc) See road junctions for further information.
Also Due to the fact that many years ago pitchforks were made with 2 prongs, this type of junction can also be referred to as a Fork in the road. Basically where it splits into 2.