An extracted note is a hosted note whose header thot has been extracted outside of the root thot's thot tree.
Creating an extracted note can be done in a few different ways:
When a thot is extracted outside of its host note's context, it is piled into Default Context by default. The Pile is implied by being extracted even if it's not shown in the user interface. Once the extracted thot is moved or once the user explicitly gives it a sponsor, its sponsors will appear under the header thot's metadata.