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A capital S before the diameter sign.
Also known as: Sphere diameter marking, SR symbol
A capital S before the diameter symbol says the feature is a sphere rather than a cylinder. Without it a radius on a ball would be read as a fillet, which is a different feature entirely.
Marks a diameter or radius as spherical rather than cylindrical, written as a capital S before the symbol.
Contexts: Technical drawing
Prevents a spherical feature being read as a cylindrical one, which the diameter symbol alone cannot distinguish.
Contexts: Technical drawing
A capital letter S set immediately before a circle crossed by a slanting line.
The S is a qualifier on the diameter symbol.