"sketches the astrological symbol of the planet Jupiter and holds it up for our inspection."
The astrological symbol for Jupiter
Public DomainThe astrological symbol for Jupiter
The planet Jupiter
Public DomainThe planet Jupiter - Credit: NASA

In astrology, the celestial bodies seen moving across the night sky (including the Sun and Moon) are thought to have a direct influence on human lives. In classical astrology there were seven planets: Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn. Each had its own symbol and characteristics. The symbol for Jupiter looks a little like a curly number 4.

This symbol is Bruno’s personal code, used to sign letters of intelligence to Elizabeth’s spymaster, Francis Walsingham.