Noun
English Wikipedia has an article on:Friday the thirteenthWikipedia
Friday the thirteenth (plural Fridays the thirteenth)
A particular date combination that occurs when the thirteenth day of a month falls on a Friday, and which is considered unlucky in some cultures.
Named days * Black Friday refers to any one of several historical disasters that happened on Fridays, and, in a general sense, to any Friday the thirteenth. Source: Internet