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Paraskevidekatriaphobia Mathematics
The formal Latin name for the fear of Friday the 13th is “paraskevidekatriaphobia.” This term combines the Greek words “Paraskeví” (meaning Friday) and “dekatreís” (meaning thirteen), with “phobia” (meaning fear).
Etymology:
- Paraskeví (Παρασκευή): Greek word for Friday.
- Dekatreís (δεκατρείς): Greek word for thirteen.
- Phobia (φοβία): Greek word for fear.
This term was coined to describe the specific fear of this particular date, which is considered unlucky in various cultures. An alternative term sometimes used is “friggatriskaidekaphobia,” which incorporates “Frigg,” the Norse goddess for whom Friday is named.
For more detailed information, you can refer to the sources discussing the psychological and cultural aspects of this phobia:
Luciadagen Hanseatics
December 13 is St Lucia’s Day, a Christian tradition celebrated mostly in the Nordic countries. This annual tradition is a symbol of bringing light in the darkness of winter, warming the hearts, and offering joy. Happy St Lucia’s Day! pic.twitter.com/FHUlEfcS2y
— Riku-Matti Kinnunen (@rmkinnunen) December 13, 2023
Happy Santa Lucia Day! Lucy is a symbol of light and hope in the darkness of winter. May we all find her when we need her, and bear her light and hope for others when we find we have some to spare. As is tradition, I made Lussekatter, or St. Lucia S-shaped rolls. ❤️🕯️❤️🕯️❤️ pic.twitter.com/3dfFrYefin
— Katie Carlson (@katiehc) December 13, 2023
Lively 300
you shall above all things be glad and young
For if you’re young,whatever life you wear
it will become you;and if you are glad
whatever’s living will yourself become…— e.e. cummings
A walk through the status of best practice literature that sets the standard of care for safety and sustainability in the education facilities built for the performance arts.
Readings: The Seven Lively Arts (1924) Glibert Seldes (Oxford Academic review)
https://twitter.com/RoyalBalletSch/status/1651974785490878464?s=20
This Is Marshall McLuhan (1967)https://t.co/HiR9l0Nk9ahttps://t.co/FEzQc7Hs3y pic.twitter.com/C8xUfOdDZe
— Standards Michigan (@StandardsMich) November 10, 2023
https://youtu.be/DcXb9KWZtZU?si=2qeTsLy2bm1VAKiL

We’re “organized” but not too organized; like the bookseller who knows where every book can be found.
at a conference where you don’t have to present
— Peyman Milanfar (@docmilanfar) April 4, 2025
#AcademicChatter #AcademicTwitter
Academics be like 👇 pic.twitter.com/6cpVEw3PVS
— Reviewer 2 (@GrumpyReviewer2) April 2, 2024