Term	Symbol
Polyhedral volume	V_p
In-sphere volume	V_sph
In-ellipsoid volume	V_el
Polyhedral area	A_p
In-sphere area	A_sph
In-sphere radius	r_i
In-ellipsoid radii	r_x, r_z
Polyhedron edge	a
Polyhedron height	h
Golden mean	$φ$
Big phi	$ϕ = φ + 1$