The number 21 is a common motif among Satanists and “demons.”
“Dead I am the life, dig into the skin
Knuckle crack the bone, twenty one to win
Dead I am the dog, hound of hell you cry
Devil on your back, I can never die“
Dragula by Rob Zombie (stance 9)
Note: The number 9 symbolizes life (think “9 lives” of a cat, etc).
Note: Businesses with the number 21 are most likely owned by Lion’s or Foxes.