Notation	Name	Unit
Al2O3	Aluminium oxide
Analysis of variance	ANOVA
ASTM	American Society for Testing and Materials
CPS	Critical particle size
FM	Fresh martensitic
ISO	International Organization for Standardization
MLP	Multilayer perceptrons
MoB	Molybdenum boride
MP	Multiphase
RBF	Radial basis networks
SiC	Silicon carbide
TM	Tempered martensitic
$\Delta m^{*}$	Normalized mass loss with contact area	%
2d	Scratch width	µm
Ag	Groove area	µm2
As	Shoulder/ridge area	µm2
d	Abrasive size	µm
Dp	Degree of penetration	-
E	Young modulus	GPa
Ec	Compressive modulus	GPa
FN	Normal load	N
h	Scratch depth	µm
H	Hardness	HV
k	Specific wear rate	mm3/Nm
r	Tip radius	µm
Ra	Arithmetical mean height	µm
Rc	Profile element average height	µm
Rku	Kurtosis	-
Rp	Highest peak	µm
Rq	Root mean square height	µm
Rsk	Skewness	-
Rsm	Mean width of the profile elements	µm
Rt	Total height of the profile	µm
Rv	Lowest valley	µm
Rz	Max. height	µm
s	Sliding distance	m
v	Velocity	m/s
Vg	Groove volume	mm3
Vs	Shoulder/ridge volume	mm3
W	Charpy ISO 148-1 (20 °C/−40 °C)	J
α	Attack angle/impact angle	°
β	Degree of wear	-
εB	Fracture elongation	%
εM	Uniform elongation	%
σc	Compressive strength	MPa
σM	Ultimate tensile strength	MPa
σY	Yield strength	MPa
$\gamma$	Indenter cone angle	°