A113 is an Easter egg found throughout the Pixar movies.
<Snipped quote by digichiptune>
Having spent several minutes wandering aimlessly, Cacelion eventually picked up on a faint, albeit concentrated, amount of malignant energy. His curiosity peaked, the Archangel made his way towards the source of the disturbance and found himself stepping directly into a classroom filled with students. He saw a boy look up at him from across the room and unintentionally locked eyes with him, which sent a small wave of anger and nausea through his body.
Calming himself, Cacelion took his eyes off of the strange boy and stepped to the front of the class to introduce himself.
"Hello!" He said in a cheerful voice. "My name is Damien Sterling, and I've just enrolled here at your school. If you have any questions you'd like to ask me, then please, go right ahead!" He said as he slid his hands into his pants pockets and did his best to ignore the wave of revulsion and hate that welled up within his body whenever he looked at that strange boy.
*summons a shadow wisp to tap her on the shoulder to wake her up as a not so friendly looking professer walks in*