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The 2DIS was a device created by the Twelfth Doctor to return objects flattened by the Boneless to their original three-dimensional state, and from three-dimensions to two-dimensions again. Its name was pronounced as "two-dis", a play on the word TARDIS. The Doctor became frustrated when Clara mispronounced its name as "two-dee-iss." (TV: Flatline)
It's possible that "2DIS" stood for "Two Dimensions in Space".