Triskaidekaphobia
noun
The fear of the number thirteen, from the Greek, and the reason lifts skip a floor that is still there. Its Friday variant, paraskevidekatriaphobia, is longer than the fear it describes. This book has no Chapter 13 either. That one is at https://humanstillwins.com/chapter-13/, where I have put the part of us that no machine can be talked into.
Also known as fear of thirteen

Triskaidekaphobia is the fear or superstition surrounding the number thirteen, often associated with bad luck or misfortune in various cultures and individuals.
It is the reason buildings skip a floor, and the reason this site has a chapter that is not printed in the book. The lift panel knows how to count. It also knows people.
See also Tokoloshe