In the TV series 'Firefly', what is the name of the spaceship?

In the TV series Firefly, the spaceship is named Serenity.

Serenity is the central setting of Joss Whedon’s 2002 science-fiction series and serves as the home, workplace, and refuge of Captain Malcolm Reynolds and his crew. It is a Firefly-class transport ship, designed for hauling cargo and passengers across the frontier of the show’s future universe. The vessel is small, aging, lightly armed, and frequently kept flying through improvisation and repair.

The name has a personal history. Malcolm Reynolds and Zoe Alleyne fought for the losing side of the civil war, and Serenity was named after the Battle of Serenity Valley, the conflict’s final major action. The name therefore reflects both freedom and defeat, themes that run through the series.

Serenity appears in all 14 episodes of Firefly, as well as the 2005 feature film Serenity and related comics. It is often confused with the similarly famous Enterprise, Millennium Falcon, or Nostromo, but those ships belong to Star Trek, Star Wars, and Alien respectively. Serenity is also the title of both the series pilot and the later film.