Daggers and boot knives have been widely used tools for centuries. The dagger had its start as a weapon during the middle ages. As time progressed, the dagger also changed.
Dagger: (noun) - a knife with a very sharp point and one or two sharp edges (usually both edges sharpened), typically designed or capable of being used as a thrusting or stabbing weapon.
The boot knife took on a major role not only in the dark ages when a small knife was usually carried in the boot but in the American West.