Today’s Oxford English Dictionary “Word of the Day” is quod erat demonstrandum. (I’m not sure if this link will stop working at the end of the day.) Apparently it took some time to find the right translation of Euclid’s Greek ὅπερ ἔδει δεῖξαι. Perhaps my art department, which knows ancient Greek, has something to say.
Via Emanuel Kowalski.
God plays dice 
It never occurred to me that the Greek initials for that phrase, transliterated into English (and ignoring breathings) is OED. Brilliant!