Paraskevidekatriaphobia

Paraskevidekatriaphobia:

Firefox browser led me to this word as a name for being afraid of bad luck and woeful events that might happen on a Friday that falls of the 13th of a month.

From AI and Chrome:

• Calendar Mechanics: Any month that begins on a Sunday will have a Friday the 13th.

• Frequency: In 2026, there are three occurrences (February, March, and November). Generally, there is at least one, and up to three, in a calendar year.

• Mathematical Cycle: The Gregorian calendar repeats its day-of-the-week pattern exactly every 400 years (146,097 days, which is exactly 20,871 weeks).

• Origins of Superstition:

• Biblical/Religious: Associated with the Last Supper, where Judas Iscariot—the 13th guest—betrayed Jesus, leading to his crucifixion on a Friday.

• Norse Mythology: The mischievous god Loki was the 13th guest at a banquet in Valhalla, breaking a 12-god, peaceful, and "complete" set, according to Britannica and Youtube.

• Historical: The arrest of the Knights Templar on Friday, October 13, 1307, is often cited as a source of the, according to Cleveland.com and EBSCO.

• Cultural Impact: The combination of "unlucky" Friday and the "unlucky" number 13 creates a "double whammy" of superstition that has been reinforced by pop culture, such as the Friday the 13th film series, note Wicked Local and Cleveland.com.