The Number 7 reminds us that the material world has its limitations. It is the number that symbolizes all the material ideas: seven colors, seven notes, seven days, seven chakras. It is the bridge to the spiritual realm. Among his more positive qualities are finding deeper understanding and It's negative side talks about manipulation of the weaks.
In Tarot, is a magic number that symbolizes the truth that can change any situation.
In Astrology corresponds to Saturn.