Americans Dont Like Number 13

    I Dont know for what reason Americans Dont like Number 13. They feel like the number is un-lucky to them. They don't use this number. Say if there's a building and it has 15 floors. But 13th floor wont be there.
You can see 12th Floor ,12B Floor , 14th Floor and 15th Floor.
   You can wonder why they are using 12 B instead of 12 A, because as per numerology A=1 so 12 A will be equivalent to 13, So they are using 12 B.
  Wow !!!!!!!!!!!!!