Haiyo (carrying a sword) refers to the practice for nobility, knights or samurai to wear a single- or double-blade sword as a token of rank in time of peace, or as a weapon in time of war.
刀や剣を貴族や騎士、武士などが身分の証として平時に身に帯びたり、戦に赴く場合に身に着けることを佩用（はいよう）と言う。