Root mean square | root | Elihu Root | Thames Path | Rusted Root | Run-length encoding | Star Wars: Darth Bane: Path of Destruction | Planck length | Path integral formulation | path integral formulation | Length overall | Root Sports | Root | Focal length | flare path | Amplified fragment length polymorphism | Sussex Border Path | Root-finding algorithm | Root! | Path to the Draft | Lewis Black's The Root of All Evil | Lewis Black's Root of All Evil | Jane Root | Honea Path, South Carolina | Halima's Path | foot (length) | Elastic Path | 35 mm equivalent focal length | World Trade Center (PATH station) | Weighted correlation network analysis |
;Find: A prefix-free binary code (a set of codewords) with minimum expected codeword length (equivalently, a tree with minimum weighted path length from the root).