fri

fri is an abbreviation most commonly associated with Friday, the fifth day of the week in many calendar systems. In the ISO 8601 framework, weeks begin on Monday, which makes Friday the fifth day. The name derives from Old English Frīġedæg, meaning Frigg’s or Freya’s day, named after the Norse goddess Frigg (and related Germanic traditions).

In modern usage, fri is widely used as a three-letter label for Friday in calendars, schedules, emails, and informal writing. It appears in both uppercase and capitalized forms depending on typographic style and sentence placement (for example, "Fri" at the start of a line or "Fri" in a header).

Cultural associations with Friday include the traditional end of the workweek in many countries and various events and expressions such as Black Friday, a major shopping day in the United States, and Friday the 13th, a superstition observed in some cultures. The day’s significance varies by country, language, and religious practice, with some traditions observing Friday as a day of rest or worship.