The moment of momentum of a particle relative to a fixed point is usually regarded as a location vector at the center of the moment? I asked what these two concepts mean, not about the right-handed system

Seems to be talking about a vector problem
The right-hand spiral rule refers to bending the four fingers and straightening the thumb, so that the direction of bending the four fingers is the same as that of the surrounding force (the force rotates around 0 point. It can also be said that it is the tangent direction). Then the direction of the thumb is the vector direction (moment vector direction)
Personal guess. According to the law of right hand in electromagnetism

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