See also: ols, öls, Öls, and øls English English Wikipedia has an article on:OLSWikipedia Noun OLS (plural OLSs) (aviation) Abbreviation of optical landing system. (statistics) Abbreviation of ordinary least squares. Synonyms (aviation): meatball Coordinate terms (aviation): ALS (Approach Lighting System) ILS (Instrument Landing System) MLS (Microwave Landing System) PAPI (Precision Approach Path Indicator) See also optical landing system on Wikipedia.Wikipedia ordinary least squares on Wikipedia.Wikipedia Anagrams -sol, LOS, S.O.L., SLO, SOL, Sol, los', sol Wikiwand - on Seamless Wikipedia browsing. On steroids.