O-op: /noh'op/ Alt. NOP /nop/ [no Operation] N. 1.

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:no-op: /noh'op/ alt. NOP /nop/ [no operation] n. 1. (also v.)
A machine instruction that does nothing (sometimes used in
assembler-level programming as filler for data or patch areas, or
to overwrite code to be removed in binaries). See also {JFCL}.
2. A person who contributes nothing to a project, or has nothing
going on upstairs, or both. As in "He's a no-op." 3. Any
operation or sequence of operations with no effect, such as
circling the block without finding a parking space, or putting
money into a vending machine and having it fall immediately into
the coin-return box, or asking someone for help and being told to
go away. "Oh, well, that was a no-op." Hot-and-sour soup (see
{great-wall}) that is insufficiently either is `no-op soup';
so is wonton soup if everybody else is having hot-and-sour.
-- The AI Hackers Dictionary

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