O.W.Ls: Ordinary Wizarding Levels. The standard-level examinations at Hogwarts. Obliviate: Memory spell that makes the subject forget. Obliviator: Member of an Accidental Magic Reversal Squad. They work for the Improper Use of Magic Office. Ollivanders: Diagon Alley wand shop. 'Makers of Fine Wands since 382 bc'. Omnioculars: Binoculars with slow-motion and replay settings. Harry Potter and all related indicia are trademarks of Warner Bros. © 2002 Warner Bros. All Rights Reserved. Harry Potter Publishing Rights © J.K.R.