From International Dictionary of Marine Aids to Navigation
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Alternative terms: Pinned, Articulated

The description of a structural member which has been secured in such a way as to permit some rotational movement, sufficient to eliminate all bending moment in the member at the joint.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM