How did Origen use critical symbols in the Septuagint column of the Hexapla?

In his monumental work, the Hexapla, the theologian Origen utilized specific critical symbols within the Septuagint column to reconcile differences between the Greek text and the Hebrew original.12

To indicate these textual variations, he employed the following marks:

• Obelus (– or ÷): Used to identify words or passages present in the Greek text but absent in the Hebrew version.2
• Asterisk (*): Used to mark words or passages found in the Hebrew text but missing from the Greek version.2

By applying these symbols, Origen sought to provide a scholarly comparison of the versions available in the 3rd century, though the subsequent omission or incorrect copying of these marks by later scribes eventually led to confusion within the Septuagint text.12