Grid fins (or lattice fins) are a type of flight control surface used on rockets and bombs, sometimes in place of more conventional control surfaces, such as planar fins. They were developed in the 1950s by a team led by Sergey Belotserkovskiy and used since the 1970s in various Soviet ballistic missile designs such as the SS-12 "Scaleboard", SS-20 "Saber", SS-21 "Scarab", SS-23 "Spider", and SS-25 "Sickle", as well as the N-1 (the intended rocket for the Soviet moon program). In Russia, they are thus often referred to as "" grid fins.