The Universal Source Code was mentioned by the Ice King in the episode "A Glitch is a Glitch". It is where Finn and Jake go to rescue everyone in Ooo, including themselves, before they are permanently deleted.
In the episode, Ice King showed to possess a vast knowledge of the Universal Source Code, even managing the Glitch to delete everything in the universe but himself and Princess Bubblegum and protecting their attributes by freezing them with ice magic to prevent the Glitch from deleting them.
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The Universal Source Code is a cyberspace dimension that stores all the components of the entire universe inside hexagonal-shaped pieces called "attributes" that are linked to the material objects in the real world. Basically, it is an alternate dimension with hexagonal pieces that are the bases to the structures of the universe linked by a grid. It appears as a vast empty space with millions of attributes in a kind of rainbow-colored pattern and has glowing colorful lights and floating mathematical equations.
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