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Parameter Name	Symbol	Family
2D Average Roughness	Ra	Legacy Parameters
Angular Power Spectral Density Function	APSDF	3D Spatial Parameters
Areal Material Ratio	Smr(c)	Material Ratio - Bearing Area
Autocorrelation Function	ACF	3D Spatial Parameters
Autocorrelation Length	Sal	3D Spatial Parameters
Average Maximum Height of the Surface	Rz	Legacy Parameters
Average Maximum Peak Height	Rpm	Legacy Parameters
Average Maximum Profile Height Along X, Y	Stylus (X,Y) Rz	2D Stylus
Average Maximum Valley Depth	Rvm	Legacy Parameters
Average Roughness	Sa	3D Height (Amplitude) Parameters
Average Roughness Along X, Y	Stylus (X,Y) Ra	2D Stylus
Band Pass Filter	Band Pass Filter	3D Filtering
Core Material Volume	Vmc(p,q)	3D Functional Parameters
Core Roughness Along X, Y	Stylus (X,Y) Rk	Material Ratio - Bearing Area
Core Roughness Depth	Sk	3D Functional Parameters
Core Void Volume	Vvc(p,q)	3D Functional Parameters
Dale Void Volume	Vvv(p)	3D Functional Parameters
Developed Interfacial Area Ratio	Sdr	3D Hybrid Parameters
F-Operator	λf	3D Filtering
Inverse Areal Material Ratio	Sdc(mr)	Material Ratio - Bearing Area
Kurtosis	Sku	3D Height (Amplitude) Parameters
Long Wavelength Pass Filter	S-Filter	3D Filtering
Material Ratio	mr	Material Ratio - Bearing Area
Material Volume	Vm(mr)	3D Functional Parameters
Maximum Height of Surface	Sz	3D Height (Amplitude) Parameters
Maximum Peak Height	Sp	3D Height (Amplitude) Parameters
Maximum Profile Height Along X, Y	Stylus (X,Y) Rt	2D Stylus
Maximum Valley Depth	Sv	3D Height (Amplitude) Parameters
Mean Profile Spacing Along X,Y	Stylus (X,Y) Rsm	2D Stylus
Mean Summit Curvature	Ssc	3D Hybrid Parameters
Normalized Surface Volume	NormVolume	Legacy Parameters
Notch Filter	Notch Filter	3D Filtering
Peak Density Along X,Y	Stylus (X,Y) Pc or Rpc	2D Stylus
Peak Extreme Height	Sxp (p,q)	3D Functional Parameters
Peak Material Portion	SMr1	Material Ratio - Bearing Area
Peak Material Volume	Vmp(p)	3D Functional Parameters
Reduced Peak Height	Spk	Material Ratio - Bearing Area
Reduced Peak Height Along X, Y	Stylus (X,Y) Rpk	Material Ratio - Bearing Area
Reduced Peak Height to Core Roughness Ratio	Spk/Sk	Material Ratio - Bearing Area
Reduced Peak Height to Reduced Valley Depth Ratio	Spk/Svk	Material Ratio - Bearing Area
Reduced Valley Depth	Svk	Material Ratio - Bearing Area
Reduced Valley Depth Along X, Y	Stylus (X,Y) Rvk	Material Ratio - Bearing Area
Reduced Valley Depth to Core Roughness Ratio	Svk/Sk	Material Ratio - Bearing Area
Root Mean Square Profile Wavelength Along (X, Y)	Stylus (X,Y) λq	2D Stylus
Root Mean Square Roughness	Sq	3D Height (Amplitude) Parameters
Root Mean Square Slope Along X,Y	Stylus (X,Y) Δq	2D Stylus
Root Mean Square Slope in X,Y	Slope Rq (X,Y)	Legacy Parameters
Root Mean Square Surface Slope	Sdq	3D Hybrid Parameters
Short Wavelength Pass Filter	L-Filter	3D Filtering
Skewness	Ssk	3D Height (Amplitude) Parameters
Stylus Pc Ratio	Stylus X Pc/ Stylus Y Pc	2D Stylus
Stylus Ra Ratio	Stylus X Ra/Stylus Y Ra	2D Stylus
Stylus Rz Ratio	Stylus X Rz/Stylus Y Rz	2D Stylus
Stylus Δq Ratio	Stylus X Δq/Stylus Y Δq	2D Stylus
Stylus λq Ratio	Stylus X λq/Stylus Yλq	2D Stylus
Summit Density	Sds	3D Hybrid Parameters
Surface Area Index	SAI	Legacy Parameters
Texture Aspect Ratio	Str	3D Spatial Parameters
Texture Direction	Std	3D Spatial Parameters
Valley Material Portion	SMr2	Material Ratio - Bearing Area
Void Volume	Vv(mr)	3D Functional Parameters