The Referee of a fencing match is sometimes also known as the director of the match.  The latter term is more colloquially used, but it is not actually a valid title for the position; the United States Fencing Association rulebook never uses the term "director".

It came to be used back in the days where multiple referees were needed for a bout, before electrical scoring devices.  There were often as many as five referees and judges presiding over a single match, and the head referee became known as the director to clearly distinguish him from the other officials.  Even though all the scoring has been machinized for decades, the term remains.