Fatto generale: 16 is the number of personality types in the Myers-Briggs classification system.
Fatto matematico: 16 is a centered pentagonal number.
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 1605 that the first edition of El ingenioso hidalgo Don Quijote de la Mancha (Book One of Don Quixote) by Miguel de Cervantes is published in Madrid, Spain.