Two vertical tubular structures joined athwartships by a platform (so that they resemble goal-posts when seen from ahead or astern).
Izakhiwo ezibutyhubhu ezithe ngqo ezimbini ezidityaniswe ngokunqamlezayo kwinqanawa ngeqonga (ukuze zifane neepali zegowuli xa zibonakala ngaphambili okanye ngasemva).