A113 (pronounced A1-13) was the classroom number used by character animation students at the California Institute of the Arts. Many of its alumni (including Pixar staff) have used the number in their professional works. It is said to appear in some way, shape, or form in every Pixar film. It has also appeared in other media made by Pixar employes, notably Brad Bird. This includes episodes of The Simpsons and the newly released Mission: Impossible-Ghost Protocol.