crown n.2[‘a crown was worn on an insignia of rank on the lapel. This practice is now obsolete but the term is still used to denote a prison officer in authority’, Tupper & Wortley, Australian Prison Slang Glossary (1990)](Aus. prison) the Principal Officer.Show quotations1990Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Crown. Principal prison officer.