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Two slanting parallel lines in a tolerance frame.
Also known as: Parallel tolerance callout
Parallelism limits departure from parallel to a datum. Like all orientation tolerances it needs a datum, and like angularity it says nothing about how far apart the two features are.
Limits deviation of a feature from parallel with a stated datum.
Contexts: Technical drawing
Controls attitude only, leaving the distance between the feature and its datum to a separate dimension.
Contexts: Technical drawing
Two straight lines of equal length leaning at the same angle, drawn side by side in a rectangular frame.
The tolerance symbol reuses the mathematical parallel sign's form.