It is the fear of number '13', considered by some superstitions to be unlucky. Like all phobias, its name is of Greek origin, by 964; 961; 949; 953; 963; 954; 945; 953; 948; 949; 954; 945; ( treiskaideka "thirteen" ) 966; 959; 946; 959; 962; ( fovos "fear" ).
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