See also: Appendix:Variations of "ron" Translingual Symbol RON (international standards) ISO 4217 currency code for the Romanian leu. English Noun RON (plural RONs) (automotive) Abbreviation of research octane number. Coordinate terms MON (motor octane number) AKI (anti-knock index) Verb RON (scheduling) Abbreviation of remain overnight. Anagrams NOR, NRO, Nor., nor, nor-, ornWikiwand - on Seamless Wikipedia browsing. On steroids.