It is a radio term. Usually if you are communicating something important to someone else over a radio you would ask "How Copy?" They then would repeat the information back to you, ensuring they received the correct information.
The term 'How copy" is a question as to whether or not the speaker's message was received sufficiently clearly to be understood. The hoped-for answer is: "Copy that', meaning "I heard and understand your lest message". This terminology is used in the military, police forces, and civil aviation.
A military helicopter
Do you hear and understand = Copy ? I copy = Yes I hear you and understand.
lifer
Avoid jargon is the first rule for constructing military correspondence.
Avoid jargon is the first rule for constructing military correspondence.
Avoid jargon is the first rule for constructing military correspondence.
Avoid jargon is the first rule for constructing military correspondence.
A "click" is one kilometer. Military maps are metric.
Chandler
Jargon is language specialized for a certain industry or field.
The police force, computer geeks, the military and the army all use jargon/slang. Doctors and people in the medical field use it as well.
definitively understood. 100% message understood