Professor Arccos was the professor of Arithmancy at the Hogwarts School of Witchcraft and Wizardry in the 1960's, and taught Henrietta Habbershaw, Thaddeus Peabody, Cecilia Fletcher, Reid Akins, and Molly Prewett.
Arccos shares his surname with the shorthand notation of the inverse trigonometric function of cosine.
The Unsinkable Molly Prewett
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