standard 80000-2:2019, and earlier in ISO 31-11 (1992).

As stated above, this article describes the ISO "physics convention"unless otherwise noted.

However, some authors (including mathematicians) use the symbol ? (rho) for radius, or radial distance, ? for inclination (or elevation) and ? for azimuthwhile others keep the use of r for the radius; all which "provides a logical extension of the usual polar coordinates notation". As to order, some authors list

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