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The three coordinates (ρ, φ, z) of a point P are defined as: The radial distance ρ is the Euclidean distance from the z-axis to the point P.; The azimuth φ is the angle between the reference direction on the chosen plane and the line from the origin to the projection of P on the plane.
This toy uses the principles of center of mass to keep balance when sitting on a finger. In physics, the center of mass of a distribution of mass in space (sometimes referred to as the barycenter or balance point) is the unique point at any given time where the weighted relative position of the distributed mass sums to zero.
Four Palaces (Vietnamese: Tứ Phủ; chữ Hán: 四府) is a major denomination of the Đạo Mẫu, an indigenous shamanic belief in Vietnam. This branch is popular in the North of Vietnam and has a profound association with the worship of Đức Thánh Trần .