This episode, which originally aired on February 26, 2012, is best known for its heartfelt and quirky tribute to the Swedish car manufacturer , following its bankruptcy.

If you are looking for a show specifically using the notation (often used for mid-season recaps or specials), it likely refers to one of the following:

Episode 18.5, titled "All of This," is a recap episode that summarizes the events of the series up to that point. Community consensus on Reddit generally suggests it is skippable if you are binge-watching.

In Season 18 (projected/upcoming), Episode 5 involves a multi-week challenge where contestants must form alliances and rank each other.

Jeremy Clarkson and James May explore the history of Saab, highlighting its engineering eccentricities, such as the ignition being located between the seats and the company's roots in aviation.