If you see a notation that includes an "S" within a circle, what does it refer to?

Name: If you see a notation that includes an "S" within a circle, what does it refer to?
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Quizplus · Accepted Answer

The notation of an "S" within a circle is a symbol used in geometric dimensioning and tolerancing (GD&T) to indicate "regardless of feature size" (RFS). This means that the specified tolerance or condition must be met irrespective of the actual size of the feature within its size tolerance.

If You See a Notation That Includes an "S" Within