noun (n)

• a tool consisting of several hooks for grasping and holding; often thrown with a rope(noun.artifact)

  Synonym:
  grapple, grappler, grappling hook, grappling iron
  

  source: wordnet30
• a light anchor for small boats(noun.artifact)

  Synonym:
  grapnel anchor
  

  source: wordnet30
• A small anchor, with four or five flukes or claws, used to hold boats or small vessels; hence, any instrument designed to grapple or hold; a grappling iron; a grab; -- written also grapline, and crapnel.(noun)

  source: webster1913