There's one in the X direction. So if we draw our XYZ axis, our three dimensional axis, that means our P orbital is in the X direction, our PY orbital is in the Y direction, and our PD orbital is in the Z direction. In other words, if we put all these guys together, we get three orbitals. And these guys are all perpendicular to each other. Why? Well, because these lines, the Z and the X axis, the X and the Y axis, and the Z and the Y axis are all perpendicular to each other.