What is it called when the title of a story in story?

There isn't a specific term for the title of a story within a story. However, depending on the context, you could use a few options:

* "Inner Story Title": This is a straightforward way to describe the title of the story within the larger narrative.

* "Embedded Title": This emphasizes the fact that the title is part of the larger story.

* "Story-within-a-Story Title": This is a more descriptive option that clearly indicates the presence of a nested story.

Ultimately, the best term to use depends on the specific context and the level of formality you want to achieve.