Odins Rune is the single Rune spread.
The Odins Rune Spread is used to gain insight on a question asked, or a situation or matter to be  addressed by Casting a single Rune.

Odins Rune is the Default Spread when you start Runes, the Ancient Oracle for the first time. You can change the Default Spread to whichever Rune Spread you like in the Preferences menu.

Using Odins Rune

To use the single Rune spread, ask of yourself a question, or ponder over any situations that are of your concern. Cast the Runes by clicking on the "Cast Runes" button and a single Rune will appear. To see the interpretation of the Rune, move your mouse pointer over the Rune. To ask another question or inquire about a certain situation, cast the Runes again.

If you would like to explore deeper into your question or matter, try moving up to the Three Rune Spread and cast the Runes again.