A113 is an Easter egg that is present in some episodes of the Simpsons and elsewhere in the franchise, particularly in ones involving Brad Bird. It refers to an animation classroom at the California Institute of the Arts, where Bird, as well as other non-Simpsons animators, had attended.
Outside of the Simpsons, A113 is mostly well-known for featuring in nearly every Pixar film, as well as other Disney media, and episodes of other animated shows including Family Guy and American Dad!.
Instances in the Simpsons
Episodes
Other
Picture
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Appearance
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Reference
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"Do the Bartman"
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Appears on Bart's prison number; the music video was directed by Bird.
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"The Simpsons Guy"
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Appears on a police car license.
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External links