Friday the 13th instance of ordinal date on a given day of the week
Friday the 13th is considered an unlucky day in Western superstition. It occurs when the 13th day of the month in the Gregorian calendar falls on a Friday, which happens at least once every year but can occur up to three times in the same year. For example, 2015 had a Friday the 13th in February, March, and November; 2017 through 2020 had two Friday the 13ths; 2016, 2021 and 2022 had just one Friday the 13th; 2023 and 2024 have two Friday the 13ths.A month has a Friday the 13th if and only if it begins on a Sunday.
type of example of manifestation of representation of