Wicca & Witchcraft - Athame
Both the wand and athame are often used interchangeably for casting a circle. However the two ritual tools in reality have very different purposes. Instead of moving and directing energy, the athame actually invokes and and banishes it.
It is also used to deal with unseen entities and forces. In other words it holds negative spirits at bay and prevents interference with spell casting. At the same time it attracts positive energies and spirits which can be extremely beneficial to the work in hand.
The athame traditionally has a steel double-edged blade and usually a black or silver handle. It must never under any circumstances be used to draw blood. If it is its power will be gone and the tool should be destroyed so that it can never be used again.
Many Witches gather in covens so please make very sure that it is legal for you to take your athame out and about with you. It is a knife and can obviously be used as a weapon. Check with your local Police that it is ok to transport it.