Because Apple is our mother. She is so much she can hardly be encompassed in something simple as a board with a bunch of chips. But all the logic, the brainpowe

Because Apple is our mother. She is so much she can hardly be encompassed in something simple as a board with a bunch of chips. But all the logic, the brainpower of her children, is located on such a board. Therefor it's only logical this be called a logic board.