The 13th floor is a superstitious concession for Asians and other cultures. There is a 13th floor they just name it the 14th floor so they don't have to hear people whine about it and change hotel rooms constantly.

People being a little-stitious In this country houses will quite often use 11a or 12a rather than 13. I heard 13 being unlucky is a stition related to when the knights templar were rounded up by the catholic church on Friday the 13th

So people into numerology and shit like that avoid the number 13 as unlucky

There was a cartoon ghostbusters episode about this.