Fatto generale: 693 is the number of sections in Ludwig Wittgenstein's Philosophical Investigations.
Fatto matematico: 693 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 693 is the number of sections in Ludwig Wittgenstein's Philosophical Investigations.
Data storica: November 23rd is the day in 1934 that an Anglo-Ethiopian boundary commission in the Ogaden discovers an Italian garrison at Walwal, well within Ethiopian territory.