Heptomology

"Every single Divination and Care of Magical Creatures lesson was now conducted in the presence of Umbridge and her clipboard. She lurked by the fire in the heavily perfumed tower room, interrupting Professor Trelawney's increasingly hysterical talks with difficult questions about ornithomancy and heptomology, insisting that she predicted students' answers before they gave them and demanding that she demonstrate her skill at the crystal ball, the tea leaves and the rune stones in turn."

- Description

Heptomology is a Divination method.

When inspecting Sybill Trelawney's classes in January, 1996, Dolores Umbridge (then-Hogwarts High Inquisitor) would interrupt her talks with difficult questions on ornithomancy and heptomology.

Behind the scenes

 * Though it is not specified what Heptomology is, the suffix "hepta" is Greek for "seven" and "logy" means "A branch of learning; a study of a particular subject". This seems to indicate it has to do with the magical properties of the number seven and is thus related to Arithmancy.

Appearances

 * Harry Potter and the Order of the Phoenix