What stage persona did Beyoncé use in the title of her 2008 double album?

Beyoncé used the stage persona Sasha Fierce in the title of her 2008 double album, I Am... Sasha Fierce.

The album was designed as two discs with contrasting identities. “I Am...” emphasized more personal and emotional songs, while “Sasha Fierce” represented the confident, performance-oriented side of Beyoncé’s stage presence. The concept gave the album a built-in contrast between private vulnerability and public spectacle.

The release included major singles such as “If I Were a Boy,” “Single Ladies (Put a Ring on It),” and “Halo.” “Single Ladies” became especially associated with its black-and-white dance video and influential choreography.

Beyoncé later said that she had retired the Sasha Fierce persona, explaining that she no longer needed to separate her stage identity from herself. The name therefore belongs most specifically to the 2008 album era, rather than being her permanent official stage name.