background_colour
barring_hole
bead
bead_end
bezier_curve
bezier_surface
binary_boolean_expression
binary_function_call
binary_generic_expression
binary_numeric_expression
block
boolean_defined_function
boolean_expression
boolean_literal
boolean_result
boolean_variable
boss
boss_top
boundary_curve
bounded_curve
bounded_pcurve
bounded_surface
bounded_surface_curve
boxed_half_space
box_domain
brep_with_voids
b_spline_curve
b_spline_curve_with_knots
b_spline_surface
b_spline_surface_with_knots