Grid fin
In 2014 , SpaceX tested grid fins on a first-stage demonstration test vehicle of its reusable Falcon 9 rocket , and on December 21 , 2015 they were used during the high-velocity atmospheric portion of the reentry to help guide a commercial Falcon 9 first stage back to land for the first successful orbital booster landing in spaceflight history . 
<triplet> Falcon 9 <subj> SpaceX <obj> manufacturer