Here I’ll take you through how I created the first S. In the Objects panel, I dragged the arc from the top of the letter inside the Sweep NURBs object so it extruded. I selected Object > Spline > Primitives and chose a rectangle, changing its the size to 16 x 16cm in the Attributes panel. Back in the Objects panel, I moved the rectangle inside the Sweep NURBs object, but above the arcs. I then repeated the whole process inside new Sweep NURBs objects to create two lower arcs, adjusting the size of the rectangles to around 9 x 9cm for the medium and 7 x 7cm for the smaller arc.