Fatto generale: 983 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 983 is a Wedderburn-Etherington number.
Trivia: 983 is an uninteresting number.
Data storica: September 9th is the day in 1493 that Battle of Krbava field, a decisive defeat of Croats in Croatian struggle against the invasion by the Ottoman Empire.