ne plus ultra
/ˌneɪ plʊs ˈʊltrɑː
/noun (the ne plus ultra)
The perfect or most extreme example of its kind; the ultimate: he became the ne plus ultra of bebop trombonists
Synonyms
the last word, the ultimate example, the best example, the perfect example, the ultimate, the height, the acme, the zenith, the culmination, the epitome, the quintessence, perfection, the nonesuch;
French le dernier cri
Origin
Latin, literally 'not further beyond', the supposed inscription on the Pillars of Hercules prohibiting passage by ships.