Firstly, it means "The Average". The mean is when you add all of the numbers together, then divide by how many numbers there are.
It generally refers to any item of a series of items that are added together (or subtracted - in Algebra, subtraction can be seen as a special case of addition). For example, in a + b, "a" is a term;...
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The term unsub in criminal terms is "Unknown Subject".
Can't say I've heard it... Are you sure it's a computer term? Are you spelling it correctly?
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