Him: N. A Small Piece Of Data Inserted In Order To Achieve A Desired Memory Alignment Or Other Addressing Property.

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:shim: n. A small piece of data inserted in order to achieve a
desired memory alignment or other addressing property. For
example, the PDP-11 UNIX linker, in split I&D (instructions and
data) mode, inserts a two-byte shim at location 0 in data space so
that no data object will have an address of 0 (and be confused with
the C null pointer). See also {loose bytes}.
-- The AI Hackers Dictionary

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