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A dagger is a knife with a very sharp point and one or two sharp edges, usually designed or capable of being used as a thrust or stabbing weapon. Daggers have been used in close combat throughout human experience. Many cultures use decorated daggers in rituals and ceremonial occasions. The unique shape and historical usage of dagger make it a symbol. Modern daggers are weapons designed for close combat or self-defense. Because of its use in a long history of weapon combination, it is closely related to masculinity and militarity. However, double-edged knives play different roles in different social environments. In some cultures, they are neither weapons nor tools, but symbols of strong masculinity. In other cases, they are ritual objects for body modification such as circumcision.

Various bayonets are described as daggers, including knives with only a single cutting edge, such as the Rondel dagger in Europe or the pesh kabz in Persia, or in some cases without a cutting edge at all, such as the high-heeled shoes of the Renaissance. However, in the last 100 years or so, in most cases, daggers have some definable features, including a short blade with a sharp cone point, a central spine or a fuller blade, and usually two cutting edges sharpen the whole length of the blade, or about the same. Most daggers are also equipped with a complete crossbeam to prevent the hand from crashing forward against the sharp edge.

Daggers are primarily weapons, so in many places, knife laws limit their manufacture, sale, possession, transportation, or use.

The earliest daggers were made of Neolithic flint, ivory or bone.

The bronze dagger first appeared in the bronze age, i.e. the 3rd century BC, while the bronze dagger of the early Minos III (2400-2000 BC) was found in Knossos.

In ancient Egypt, daggers were usually made of copper or bronze, while the royal family used gold weapons. At least from the time of Egypt (3100 B.C.), daggers were decorated as ritual objects with golden hilts, and later became more gorgeous and diverse. Midvein design restores an early silver dagger. When the tomb of Tutankhamun opened in 1924, two daggers emerged, one with a gold blade and one with molten iron. It is believed that the mummies of the eleventh Dynasty were buried with bronze sabres. There is also a bronze dagger of TUT III. (18th dynasty), ca. 1600 BC. Until mene Ptah II. In the 19th century (1300 BC), we read about bronze armor, swords, and daggers in the list of spoils after the battle of Prosopis.

Iron production did not begin until 1200 BC, and no iron ore was found in Egypt, making iron daggers rare, and the context suggests that iron daggers are valued at the same price as ceremonial gold. These facts, as well as the composition of the dagger, have long suggested the origin of the meteorite, but until June 2016 researchers used X-ray fluorescence spectroscopy to confirm that the proportion of metals was similar (iron, 10% nickel, and 0.6% cobalt in meteorites found in the area), which were deposited by ancient meteor showers.

One of the earliest objects made of molten iron was a dagger dating back to 2000 B.C., which was found to indicate that it was regarded as an ornament of great value. The dagger is located in Alaca H? y? k) In a 2500 BC royal mausoleum in hadikt, the dagger has a smelting iron knife and a gold handle.