According to Numerologists, Number 13 is unlucky. And we have missing number 13 at:

1. The Bombay Stock Exchange does not have a floor number 13. Floor 12 is followed by Floor 14.

2. In Chandigarh, there is no Sector 13.

3. Some airlines omit the row number 13.

The number 13 is associated with bad luck in some countries, and even has a phobia, Triskaidekaphobia.