Δa	Ductile crack extension
AIDE	Adsorption-induced dislocation emission
CT50	Compact tension specimens with width W = 50 mm and thickness B = 25 mm
CTOA	Crack tip opening angle
EDM	Electric discharge machining
ESD	Equivalent spherical diameter
FEM	Finite element method
FIB	Focused ion beam
HE	Hydrogen embrittlement
HEDE	Hydrogen-enhanced decohesion
HELP	Hydrogen-enhanced localized plasticity
HESIV	Hydrogen-enhanced strain-induced vacancies
J	J-integral
MVC	Micro-void coalescence
PCHIP	Piecewise cubic Hermite interpolating polynomials
QC	Quasi-cleavage
ROI	Region of interest
SOD	Source-to-object distance
SEM	Scanning electron microscopy
SDD	Source-to-detector distance
SNR	Signal-to-noise ratio
µ-CT	Micro-computed tomography