The Power of Three logo is a symbol of sisterhood and strength from the American fantasy drama television series Charmed. The logo features a triquetra, a Celtic symbol of the three phases of the moon. The three sisters of the Charmed Ones are often seen holding hands in a circle, which is a representation of their power and connection. The logo is then used throughout the series as a symbol of the sisters' bond and their ability to defeat evil. A fanart Charmed The Power of Three Logo Sticker.