Muggles' Guide to Harry Potter/Characters/Professor Vector

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Muggles' Guide to Harry Potter - Character
Professor (Septima) Vector
Gender Female[1]
Hair color Unknown
Eye color Unknown
Related Family Unknown


Professor Septima Vector is the Arithmancy professor at Hogwarts School of Witchcraft and Wizardry.

Role in the Books[edit]

Beginner warning: Details follow which you may not wish to read at your current level.

Philosopher's Stone[edit]

Chamber of Secrets[edit]

Prisoner of Azkaban[edit]

Goblet of Fire[edit]

Order of the Phoenix[edit]

Half-Blood Prince[edit]

Deathly Hallows[edit]



Relationships with Other Characters[edit]


Arithmancy is otherwise known as numerology, which is in fact a real subject. It involves the finding of magical properties of numbers.

In the Harry Potter world, numbers are often inscribed in places, such as tombs, pyramids, and monuments. These numbers supposedly have meaning, either hiding a secret message or protecting the site with a curse. Arithmancy, if applied correctly, allows the practitioner to interpret these findings.

Gringotts curse breakers are required to have sufficient knowledge of Arithmancy.


Study questions are meant to be left for each student to answer; please don't answer them here.

  1. Hermione repeatedly states that Arithmancy is very useful. What kind of things might be taught in an Arithmancy class, that Hermione would see as being particularly useful?

Greater Picture[edit]

Intermediate warning: Details follow which you may not wish to read at your current level.


  1. In Harry Potter and the Prisoner of Azkaban (Chapter 12) Ron mentions her as a Witch.