What is the title of Beyoncé's 2008 double album?

Beyoncé's 2008 double album is titled I Am... Sasha Fierce.

Columbia Records released the album on November 12, 2008. Its two discs were designed around contrasting sides of the performer: I Am... emphasized more personal ballads, while Sasha Fierce presented a more assertive stage persona. Beyoncé described Sasha Fierce as an alter ego associated with performing.

The album included “If I Were a Boy,” “Halo,” “Diva,” and “Single Ladies (Put a Ring on It).” “Single Ladies” became one of Beyoncé's most recognizable songs, while its black-and-white dance video became a major part of the song's cultural impact.

The title is sometimes shortened incorrectly to Sasha Fierce, but the official album title includes both parts. It followed B'Day, released in 2006, and preceded 4, released in 2011.