Fatto generale: 16 is the number of teams that qualified for the finals of the FIFA World Cup from 1934 through 1978 (although for various reasons, only 15 competed in the 1938 and 1950 finals).
Fatto matematico: 16 is the hexadecimal system, a common number system used in computer programming, uses 16 digits where the last 6 are usually represented by letters: 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F.
Trivia: 16 is the minimum age that one can drop out of school in most states of the US (however, restrictions apply and vary depending on state).
Data storica: January 16th is the day in 929 that Emir Abd-ar-Rahman III established the Caliphate of Córdoba.