[Latin] ne plus ultra [Notes] Also nec plus ultra or non plus ultra. A descriptive phrase meaning the best or most extreme example of something. The Pillars of Hercules, for example, were literally the nec plus ultra of the ancient Mediterranean world. Holy Roman Emperor Charles V's heraldic emblem reversed this idea, using a depiction of this phrase inscribed on the Pillars—as plus ultra, without the negation. The Boston Musical Instrument Company engraved ne plus ultra on its instruments from 1869 to 1928 to signify that none were better. [Translation] 
nothing more beyond