On Friday the 13th, all of our fears and superstitions come out to play, which is why it is known as "Friday the 13th". Due to recent world events, this Friday the 13th may feel even more spooky than normal.

Although it's just another number in traditional numerology, one is surely aware of the unlucky reputation of the 13th. Or maybe they have a phobia of the number 13, known as triskaidekaphobia, or a fear of Friday the 13th, known as paraskevidekatriaphobia?

Many people believe that Friday the 13th brings bad luck, just as going under a ladder, running into a black cat, or shattering a mirror. 13 has long been associated with bad luck, even if it is unclear when and where it originates from.

Superstition of Number 13: Why don't some buildings have a 13th floor?

The 13th floor is a designation of a level in a multi-level building that is typically removed in nations where the number 13 is considered bad. Even non-superstitious building owners are aware that flats on the 13th level may be less desirable because of superstitious tenants, or commercial tenants who are concerned about losing superstitious clients.

It is hard to believe that the majority of people would choose to avoid the 13th level. What has transpired in history to make the 13th level such a stigmatized place? The 13th level seems to be the subject of many stories, some recorded, others not.  The 13th floor of government buildings, for example, has been alleged to house top-secret government departments, or, more broadly, that it is indicative of something nefarious or clandestine going on in government buildings.

Adding a floor between two floors that are accessible by elevator requires either a longer journey time or a faster speed, both of which would be observed by the passengers. As a result, either an extra row of impact windows or a visible gap between rows would be required.  A hidden level such as the 13th floor would be considerably more useful as a basement since it would be much simpler to conceal the position of the 13th floor in what appear to be single-story structures, beneath.

Triskaidekaphobia on the building owner's or builder's side is one reason for missing the thirteenth floor. Another reason is to prevent difficulties that may occur with superstitious tenants, customers, or employees. Dilip Rangnekar of Otis Elevators reported in 2002 that 85 percent of the buildings using Otis brand elevators did not have a floor called the 13th floor, based on an internal assessment of records. Fearing a fire on the 13th level or residents' beliefs about it, early tall-building builders chose to remove the 13th floor from elevator numbers.