Symbols:
x-x - axis along a member
y-y - axis of a cross-section
z-z - axis of a cross-section
u-u - major principal axis (where this does not coincide with the y-y axis)
v-v - minor principal axis (where this does not coincide with the z-z axis)
b - width of a cross section
h - depth of a cross section
d - depth of straight portion of a web
tw - web thickness
tf - flange thickness
r - radius of root fillet
r1 - radius of root fillet
r2 - toe radius
t - thickness