The septagram, or Faerie Star, is used by many Faerie and Celtic-based traditions. The seven points represent the Sun, the Forest (or Wood), the Sea, Magic, the Moon, the Wind, and Connection (or Spirit).
Image of the Elven Star- People sometimes wear it as an amulet to keep people from reading their mind. You could also use it on a book of spells to keep people from understanding, or knowing the true nature of the contents. The seven pointed star is a magical symbol, and the 7 points have many secret meanings, such as the 7 days of the week, the 7 pillars of wisdom, the 7 wonders of the world, or in Las Vegas with the 777 jackpot. Believe me, this is no coincidence.