A) Box-frame construction C) Closed truss
a) Sill beam b) Post c) Stud d) Transverse beam e) Common rafter f) Couple g) Principal h*) Collar i) Queen strut j*) Tiebeam k) Axial beam
l*) Jowl
l*) Jowl m) Crown plate (commonly called collar purlin) n) Upward brace p) Crown post
j*) Tiebeam q) Common rafter truss r) Wall plate s) Arch brace