Professor Septima Vector was a witch who worked as a Professor of Arithmancy at Hogwarts School of Witchcraft and Wizardry. She is described as a strict teacher among students although Hermione Granger considred Professor Vector's classes her favorite.
 Character development
Sometime in her life she was offered a job as Professor of Arithmancy at Hogwarts and was employed under Headmaster, Albus Dumbledore. Her classroom in located on the seventh floor is Classroom 7A.
 Philosopher's Stone
Professor Vector was present at the sorting of Harry Potter and his fellow classmates and enjoyed the feast among the other teachers.
 Prisoner of Azkaban
During 1993, Hermione Granger took the class as an elective subject with the use of her time turner. This caused some confusion with friend, Ron Weasley who heard Hermione talking to Professor Vector about her class. "I heard [Hermione] talking to Professor Vector, that Arithmancy witch, this morning. They were going on about yesterday's lesson, but Hermione can't've been there, because she was with us in Care of Magical Creatures!"  She was the star pupil of the class and well liked by Professor Vector
 Goblet of Fire
An unusual occurrence happened on the first day of the school year this year as Professor Vector gave the fourth years no homework.
 Order of the Phoenix
After explaining his adventure in convincing giants to join the 'good side' to Harry Potter, Hermione Granger and Ron Weasley, Rubeus Hagrid almost knocked Professor Vector off her feet as he waved his hand in the air with excitement.
 Half Blood Prince
Professor Vector is only mentioned after Hermione has to see Professor Vector as they thought she made a mistake in her essay.
 Deathly Hallows
Professor Vector most likely participated in The Battle of Hogwarts during the reign of Lord Voldemort and probably survived.
 Portrayals within films
Professor only appears in the film adaption of Harry Potter and the Philosopher's Stone and is played by an unknown actress.
 Outward appearance
Professor Vector is seen as a witch with a pale face and dark hair, usually wearing long red robes.
 Personality and skills
Professor Vector is known to be a very strict teacher who gives out masses of homework and essays. Being a Professor of Arithmancy, she would be very skilled in the area, and if she attended Hogwarts, she would have gotten extremely high marks in her O.W.L.s and N.E.W.T.s.