Pentacle
The pentacle is, in ceremonial magic, a protective disk with magical inscriptions (sigils, names of angels, symbols). Different from the pentagram (5-pointed star). The famous Pentacles of Solomon from the medieval grimoire are wax/metal disks with inscriptions in Hebrew or Latin.
Pentacle in tarot
One of the four suits of minor arcana (Pentacles = earth, material, money). Stylized as a coin with engraved pentagram, especially in the Rider-Waite tarot.