noun
a pointed metal tool used by sailors to separate strands of rope or wire.
Origin:
early 17th century (originally as marling spike): from marling, present participle of marl ‘fasten with marline’ (from Dutch marlen 'keep binding') + spike

Chris Clayson on Flickr
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Ben sat on the hatch cover, splicing the halyard. Tomorrow, his marlinspike work would be tested when the ship tried to ride out the hurricane called Mariah. [Loved that song as a kid]