“Steep S” riser
The “steep S” riser is similar to the “lazy S” except that the lower section of the flexible pipe between the buoy and the riser base is used as a tension member. The riser base replaces the deadweight anchor.
Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards