What's up with the number Twelve?

• 12 tribes of Israel
• 12 hours in the day; 12 hours in the night; 12 hours on a clock
  
• 12 apostles
  
• 12 signs of the zodiac
  
• 12 months of the year
• 12 jurors on a jury
  
• 12 days of christmas
• There are 12 function keys on a computer keyboard f1-f12
• There are 12 digits on a telephone keypad 0-9 plus # and *
• There are 12 total notes in an octave c,c#,d,d#,e,f,f#,g,g#,a,a#,b
• There 12 grades in elementary and high school

And that's only scratching the surface. There's a quilt in there somewhere...