ACF autocorrelation function	Sa arithmetic mean height Sa, µm
DGS-F denoising Gaussian S-filter	Sal autocorrelation length, mm
DMAF denoising moving average filter	Sbi surface bearing index
DMF denoising median filter	Sci core fluid retention index
DWF wavelet denoising filter	Sdq root mean square gradient
F-surface form surface	Sdr developed interfacial areal ratio, %
Gauss regular Gaussian regression filter	Sk core roughness depth, µm
MQCL Minimum Quantity Cooling Lubrication	Sku kurtosis
NSP noise-sensitive parameters	Sp maximum peak height, µm
Poly 2nd polynomial of 2nd order	Spc arithmetic mean peak curvature, 1/mm
Poly 4th polynomial of 4th order	Spd peak density, 1/mm2
PSD power spectral density	Spk reduced summit height, µm
Robust regular robust Gaussian regression filter	Sq root mean square height, µm
S-F surface A surface after S- and F- filtering	Ssk skewness
S-filter removes small-scale lateral components	Std texture direction,°
S-surface short-wavelength noise surface	Str texture parameter
SLM selective laser melting	Sv maximum valley depth, µm
ST surface topography	Svi valley fluid retention index
TDM treatment-(traces)-direction-method	Svk reduced valley depth, µm
VEM valley excluding method	Sz the maximum height of surface, µm
WLI White Light Interference