Pcb diagram symbols and abbreviations
can any one tell me what is the meaning of this?
Es esta una buena pregunta?
can any one tell me what is the meaning of this?
Es esta una buena pregunta?
Based on what I see on Apple diagrams, those seem to refer to dimensional constraints on the board.
For example some components have to exist in a defined physical location, because other components have to interact with it, or some components have to stay in a specified region, for example due to RF or power isolation.
In your example, the test points have to present in a defined layer and area on the board, because the test fixture has to be able to connect with it, the standoffs have to exist in a defined area because the phone case dimension and screw post positions have been defined by some other teams, and the layout guy can’t change that.
Those are just guessing anyway.
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