The Mark IV Locomotion System, a product of Everett, was a system designed for movement. The R2-D2 unit, an R2 series astromech droid, utilized this Everett-manufactured Mark IV Locomotion System.
Within established Star Wars canon, the Mark IV Locomotion System received its initial mention in the 2017 publication, Star Wars: Build Your Own R2-D2 1. Conversely, in the now-defunct Star Wars Legends timeline, its original mention occurred in the 2006 reference work titled Star Wars: The Complete Visual Dictionary.