Eikositriophobia (from Greek words eikosi, "twenty", and tria, "three"), or Icosatriophobia, is the fear of the number 23. The fear is linked to the 23 enigma, which tells about the belief that most incidents and events are directly connected to the number 23. 23 can be thought of as the second most fearful two-digit number after 13 (see Triskaidekaphobia). The enigma was originated by novelist William S. Burroughs, who claims that Captain Clark had a shipping accident that killed him and everyone else onboard after exactly 23 years after Clark sailed for the first time. About the same time, airplane Flight 23 ,whose pilot was also Captain Clark, had crashed. Upon learning those claims, people started fearing of tragedy taking place when eclipsing the 23 mark or the number they're on, and so sufferers , for example, would not be in a vehicle or place that has the number 23 in its name. Eikositriophobes who are 23 years old may worry that they could die tragically at that very age.