Sagittarius & Libra: Symbol Symmetry of the Objects
Sagittarius and Libra exhibit symbolic symmetry. It is not obvious but both are man made items. If you point Sagittarius straight upwards it's noticeable, but then it will look like an upside down cross. Likewise if you tilt the balance on the right then Libra will match Sagittarius. And the many balances often have an arrow indicator.
Another united symbol of the original form, it is a perfect balance where the indicator points straight up. Librattarius or Sagittarlibra is united form of these associated symbols.