Sgian-dubh

The sgian-dubh (/ˌskiːən ˈduː/SKEAN-dhu;) is a small, singled-edged knife (Gaelic sgian) worn as part of traditional Scottish Highland dress along with the kilt. It is worn tucked into the top of the kilt hose with only the upper portion of the hilt visible. The sgian-dubh is normally worn on the right leg, but can also be worn on the left, depending on whether the wearer is right or left-handed.