Fatto generale: 12 is the number of basic hues in the color wheel (3 primary colors (red, yellow, blue), 3 secondary colors (orange, green & purple) and 6 tertiary colors).
Fatto matematico: 12 is a superfactorial, being the product of the first three factorials.
Trivia: 12 is the number of keys in any standard digital telephone (1 through 9, 0, * and #).
Data storica: January 12th is the day in 2007 that Comet C/2006 P1 (McNaught) reaches perihelion becoming the brightest comet in more than 40 years.