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patch space

patch space: n. An unused block of bits left in a binary so that
   it can later be modified by insertion of machine-language
   instructions there (typically, the patch space is modified to
   contain new code, and the superseded code is patched to contain a
   jump or call to the patch space).  The widening use of HLLs has
   made this term rare; it is now primarily historical outside IBM
   shops.  See patch (sense 4), zap (sense 4), hook.