Altar tiles are often used to invoke extra intention and the meaning of the symbol into your sacred space, rituals and spell work.
A Pentacle is the single most powerful symbol and the best representation of the Four elements: Earth (lower left point), Air (upper left point), Fire (lower right point) and Water (upper right point), and Divine Spirit pointing upwards. The Pentacle is also the symbol of protection. It act as protection from negative and evil energies. In addition, it allows you to conjure, command and control those forces which may harm you.
* Does not include wooden tray or dried rosemary in pictures