A talisman is any object that has been imbued with magic. Characters of the witch class have the ability to create talismans, though certain other entities in the supernatural world have the ability as well.
Talismans take many shapes: potions, scrolls, wands, staffs, amulets, etc. Modern devices can be made into talismans, but this is uncommon. The more complex an object, the harder it seems to be to enchant. Gun talismans are tough to create; computer talismans are damn near impossible. For this reason, many witches prefer to stick to the more traditional media for talismans.
Talismans that contain White or Black magic spells are themselves considered to be objects of White or Black magic. Using or benefiting from such a talisman counts as having used a spell of the same color. (So a witch who uses a Black magic wand cannot use any White magic until the next day. If she had already used a White magic spell that day, the wand will not function for her.)
Most Talismans are temporary items created by witches and imbued with a spell. Some Talismans are permanent or semi-permanent, and some are even cursed. Lists of specific Talismans will follow.