HARRY POTTER Mug Gryffindor Crest. This Harry Potter mug is a great way to add a little fun to the home. It features the Gryffindor house crest on the front, which stands for courage, bravery, nerve, and chivalry, and the Hogwarts crest at the back, which features all four houses. This mug comes in an open gift box. A perfect gift idea for a true Harry Potter fan.