I have never understood what is meant when scientists say a “single point” is it something physical like an atom or or a size like the plank length?
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Its usage dependent. But I get the feeling you mean a mathematical point in space time. Its a dimensionless point. Exactly 0 meters in every dimension. It doesn’t have a size. So if you pick a point in space of 1, 1, 1 it has 0 volume. There is no radius because the location is 1.00000….. on each axis. Its not spread over an area. It’s not even a plank length size point, because a plank length still covers an area.
If you don’t mean the mathematical point, its generally determined by the scope of the measurement and precision required. A point in space for a satellite could be a cubic meter or a cubic kilometer. Depends on how accurate they want to be.
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