An Athame or Atham? is a ceremonial dagger, with a double-edged blade and usually a black handle. It is the main ritual implement or magical tool among several used in the religion of Wicca, and is also used in various other neopagan witchcraft traditions. A black-handled knife called an arthame appears in certain versions of the Key of Solomon, a grimoire originating in the Middle Ages.
The athame is mentioned in the writings of Gerald Gardner in the 1950s, who claimed to have been initiated into a surviving tradition of Witchcraft, the New Forest Coven. The athame was their most important ritual tool, with many uses, but was not to be used for actual physical cutting.
There has been speculation that Gardner's interest and expertise in antique swords and knives, and in particular the magical kris knives of Malaysia and Indonesia, may have contributed to the tool's central importance in modern Wicca. 
On the other hand, the athame stands as one of the four elemental tools in Wicca; traditionally standing for fire, as does the ritual sword. (From the known origins of Wicca, with Gardner's own Book of Shadows, the athame represents fire; where the wand corresponds to air. Other varieties of Wiccan practice may switch those two around.) The other three elemental tools are the wand, the pentacle, and the cup or chalice. These four magical tools correspond to four 'weapons' of significance in Celtic myth - the sword, the spear, the shield, and the cauldron (and/or grail). The same four ritual tools also appear in the magical practices of the western hermetic tradition, derived from The Golden Dawn; and they appear in tarot decks as the four card suits: swords, cups, wands, and pentacles. The athame is an individual ritual tool, while the sword is more appropriate as a coven tool, or the personal tool of the high priest or high priestess. There are obvious risks associated with an entire group of people all wielding swords, while confined within a small ritual circle space nine feet in diameter; this safety factor, as well as ease of use, may explain why the emphasis within Wicca is more on each witch's personal athame, rather than the ritual sword.
6 Historical parallels
7 See also
An athame can take many forms. It usually has a double-edged blade with a sharp point, and a handle which is often black. (A double-edged blade and black handle are required in almost all covens which practice some variant of British Traditional Wicca, including Gardnerian and Alexandrian.) The handle may be inscribed with particular symbols dictated by the tradition. Janet and Stewart Farrar in A Witches' Bible suggest that the point of an athame be dulled so as to prevent un-intended physical harm during ritual use.
In eclectic forms of Witchcraft the handle decorations range from astrological glyphs to runes, the symbols being chosen by the owner. Many fantasy-themed athames are also available from medieval and neopagan supply shops.
The athame's primary use is to channel and direct psychic energy, generally conceived as etheric fire. If things such as herbs or cords need to be cut, another knife called a boline - a white-handled knife - is used. An exception is the "kitchen witchcraft" philosophy, which actively encourages the use of magical tools for mundane purposes to increase the witch's familiarity with them.
The ritual drawing of the boundary of the Magic circle - also known as "casting the circle" - is usually done with either a ritual sword or an athame, in traditional coven practice. For open rituals in public places, this is sometimes done with a ritual wand or staff instead, since there may be legal complications involved with swords and daggers in public places, even when the edges have been dulled. In most traditional covens, the athame is associated with the magical element of fire, so the circle is considered to be cast in etheric fire. This fire is traditionally envisioned as blue, indigo or violet; although it may equally well be envisioned as other colors. When the circle is ritually purified after being cast, that is traditionally done with the remaining three elements -- air (incense), water (salt-water), and earth (salt) -- because the element of fire has already been imbued into the circle during the casting, by the use of the athame.
After the casting, the athame is the tool traditionally used to invoke the elemental guardians of the four directions - also termed "calling the quarters" - typically by drawing elemental pentagrams at each quarter. This important traditional practice is one of the reasons often given for the requirement that the athame must be double-edged; because attempting to trace a pentagram in the air with a single-edged blade will require some awkward twisting of the hand and wrist, in order to keep the single cutting edge in the direction of motion.
As a masculine principle, the athame is often used in combination with the chalice, as feminine principle, evoking the act of procreation, as a symbol of universal creativity. The athame represents the magical element of fire, associated with the Sun and the Horned God; while the chalice represents the magical element of water, associated with the Moon and the Goddess. The union of the two then represents the union of God and Goddess, male and female, sun and moon, fire and water. The marriage of the Sun and Moon -- the union of opposites -- is an ancient idea in alchemy; and the hieros gamos or sacred marriage of god and goddess is an even more ancient idea in pagan religions. (For example, in ancient Greece - from whence the term "hieros gamos" comes.) This rite is done by dipping the athame into the chalice to bless the wine. This is a symbol of the Great Rite in Wiccan rituals. Some modern witchcraft traditions may prefer not to use iron blades, instead preferring alternatives such as copper, bronze or stone, such as obsidian. This is most common amongst traditions that have a particular fondness of the Sidhe, to whom iron is supposedly baneful.
Most Wiccan traditions associate the athame with the masculine principle and with the element of fire, as did Gerald Gardner; while the wand is associated with air. Other traditions may reverse these elemental associations, and use the athame to represent air and the wand to represent fire. Janet and Stewart Farrar suggested this difference is due to the Golden Dawn releasing false information in the hopes of preventing its rituals being used in the correct way. They add that a witch should always choose the association which seems the most correct to them.
Fire and water are considered to be polar opposite elements, classically and in alchemy and traditional magical practice. They are sometimes considered to be the two primordial elements, the combination of which gave rise to the other two elements of earth and air. Fire and water are also the elements most associated with Sun and Moon, and thus the Horned God and the Goddess within Wicca. For this reason, covens that associate the athame with air (and the wand with fire) may decide to use the wand to bless the wine chalice, instead of using the athame. A union of air and water does not carry the same symbolic significance of the "conjunctio oppositorum" (union of opposites) that the union of fire and water does. Also, covens that regard the athame as air and the wand as fire may choose to cast the ritual circle with the wand or staff, instead of the sword or athame - if they conceive of this casting in the traditional way, as a casting of etheric fire via a projection of psychic energy. If they conceive of the circle casting as cutting a line in the air with the tool of air, then they may choose to purify the circle with the remaining three elements of fire, water, and earth; this would involve using a candle to purify the circle, and omitting the incense, since the circle has already been imbued with the element of air.
The athame is the most important ritual tool in Wicca, and like other ritual tools it is generally purified and consecrated to the Gods before being used for ritual and magical purposes. There are various ways of accomplishing ritual purification and consecration, depending on the specific tradition of Wicca being followed, and also whether the individual Wiccan is practicing with a coven or as a solitary witch. One common way to do this is by using the four magical elements of fire (candle), air (incense), water and salt; and perhaps anointing the blade with an oil infused with magical herbs. Touching another person's athame without permission is considered a ritual faux pas in almost all traditions of Wicca. It is an intrusion of the owner's personal space; and more importantly, it is an act that violates the magical bond between the athame and its owner. Some witches will go to great lengths to ritually purify, reconsecrate, and rededicate an athame after it has been touched by another person.
There are rituals of consecration for a newly acquired athame, be it new, or acquired from another person. When purchasing a knife for this purpose (or any ritual tool) it is considered important never to haggle over the price.