Fatto generale: 318 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 318 is the number of unlabeled partially ordered sets of 6 elements.
Trivia: 318 is a boring number.
Data storica: November 13th is the day in 1927 that the Holland Tunnel opens to traffic as the first Hudson River vehicle tunnel linking New Jersey to New York City.