grapnel
grapnel is an anchor or grappling hook.
Also recorded as drag; grapnel anchor.
Overview
Tool used in shipping.
In detail
It forms part of water transport.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Grapnel anchor”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q10476409: grapnel
Consult the source