isotropic

bulk f

bulk modulus, $K$

poisson f

Poisson’s ratio, $\nu$

shear f

shear modulus, $G$

young f

Young’s modulus, $E$

Notes:

Only one of the two options is required to define the elasticity: bulk modulus $K$ and shear modulus $G$, or, Young’s modulus $E$ and Poisson’s ratio $\nu$. When choosing the latter, Young’s modulus $E$ must be assigned in advance of Poisson’s ratio $\nu$.