Beyoncé’s confident stage persona introduced during her 2003–2004 era was Sasha Fierce.
Beyoncé described Sasha Fierce as an alter ego that helped her perform with greater boldness and confidence. She said the persona emerged during the Dangerously in Love era, particularly in connection with performing “Crazy in Love.”
The name became especially prominent with the 2008 double album I Am... Sasha Fierce. Its two discs presented contrasting sides of the performer: the “I Am...” disc emphasized more personal and introspective material, while the “Sasha Fierce” disc focused on energetic, dance-oriented songs.
The album included “Single Ladies (Put a Ring on It),” “If I Were a Boy,” and “Halo.” Beyoncé later said that she no longer needed to separate herself from the persona, explaining that Sasha Fierce had served its purpose. Terms such as “Yoncé” and “Queen Bey” are associated with Beyoncé, but they are not the name of this particular alter ego.