operation code 
noun Computing
The part of a machine code instruction that defines the operation to be performed.Send both numbers and the operation code to the execution unit.
- local area network
- local attraction
- local authority
- local battery
- local board
- local bubble
- local bus
- local call
- local circuit
- local coloring
- local colorist
- local colour
- local colouring
- local colourist
- local content
- local council
- local councillor
- local councilor
- local derby
- locale
- local education authority
- local election
- local examination
- local exchange
- local exchange carrier