harpax
harpax is a grappling hook.
Also recorded as harpago.
Overview
Roman catapult-shot grapnel.
In detail
harpax is a grappling hook.
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
“Harpax”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q4133880: harpax
Consult the source