Janus Galloglass

Janus Galloglass was a shop located in Diagon Alley in London, England, specialising in all kinds of mirrors: scrying mirrors, enchanted mirrors, haunted mirrors. It also advertised Catoptromancy apparatuses, such as psychomanteums.

Etymology

 * , in ancient Roman religion and myth, is the god of beginnings and transitions. He is usually depicted with two opposing faces, which would suggest something mirrored.
 * "Galloglass" appears to be a portmanteau of Galleon, a wizarding form of currency, and "glass".

Appearances

 * Harry Potter and the Philosopher's Stone