3D Universal Edge Routers is Juniper Network's Series Product name. you can find more info in there.
3D
means a physical, you can touch's product, it correspondscontrast to virtual product.
Universal
means its usage vast, not limit to Juniper product, it can also join up to Cisco, Huawei and so on network products.
Edge
means the Internet's edge. if you know networking knowledge you can understand easily.