nagamaki
nagamaki is a pole weapon or Japanese sword.
Overview
Japanese sword with an extra long handle.
In detail
It is associated with Japan.
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
“Nagamaki”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q1304426: nagamaki
Consult the source