Friday recognize the days after. In some Islamic countries, the week begins on Sunday and ends on Saturday, just like the Jewish week and the week in some Christian countries. The week begins on Saturday and ends on Friday in most other Islamic countries, such as Saudi Arabia, Somalia, and Iran. Friday is also the day of rest in the Bahá'í Faith. In some Malaysian states, Friday is the first week-end day, with Saturday the second, to allow Muslims to perform their religious obligations on Friday. Sunday is the first working day of the week for governmental organisations. Jewish Sabbath begins
Friday the 13th strengthen the superstition about Tuesday. In addition, in Greek the name of the day is Triti ("Τρίτη") meaning the third (day of the week), adding weight to the superstition, since bad luck is said to "come in threes". Tuesday the 13th occurs in a month that begins on a Thursday. In Italian popular culture, Friday the 17th (and not the 13th) is considered a day of bad luck. The origin of this belief could be traced in the writing of number 17, in Roman numerals: XVII. By shuffling the digits of the number one can easily get the word VIXI