operation code
noun/ˌɒpəˈreɪʃn kəʊd/
/ˌɑːpəˈreɪʃn kəʊd/
(also opcode)
[uncountable, countable] (computing)- an instruction written in machine code which relates to a particular task
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operation code
Definition of operation code noun from the Oxford Advanced Learner's Dictionary