12 things that are 12
1.12 hours on the clock
2.12 months in a year
3.12 astrological signs
4.12 chakras
5.12 apostles
6.12 kinds of fruit on the tree of life
7.12 in a dozen
8.12 cranial nerves in the human body
9.12 musical notes
10.12 inches in a foot
11.12 knights of the round table
12.12 elementary particles of matter
This is only a short list of things that are 12. For more on 12, this episode of Ancient Aliens, called The Divine Number, and this book, The Divine Number 12, by CJ Dodaro, are both interesting.