Which of the following drawing symbols indicate flatness of a surface:

Explanation:

Drawing symbols of a surface:

Features	Tolerance Type	Characteristic	Symbol
For single features (not related to a datum)	Form	Cylindricity
		Flatness
		Profile of line
		Profile of a surface
		Roundness (Circularity)
		Straightness

Additional Information

Datum

• A datum is a theoretical exact plane, axis, or point referenced to a location that GD & T (Geometric Dimensioning and Tolerancing ) or dimensional tolerances.
• It can be considered as an anchor for the entire part, where the other features are referenced from.
• A datum feature is usually an important functional feature that needs to be controlled during measurement as well.
• All GD & T symbols except for the form tolerances like straightness, flatness, circularity, and cylindricity can use datums.
• When it comes to GD & T, datum symbols are your starting points where all other features are referenced from.

Features	Tolerance Type	Characteristic	Symbol
For single features (not related to a datum)	Orientation (Also called Attitude)	Angularity
		Parallelism
		Perpendicularity (Squareness)
		Profile of line
		Profile of a surface
	Location	Concentricity
		Coaxiality
		Profile of line
		Profile of a surface
		Position
		Symmetry
	Run-out (Also called composite)	Circular run-out
		Total run-out