The Landau began as a carriage design with a folding fabric top consisting of two sections supported by external elliptical springs. This landau roof design was adopted in early automobiles as a convertible top. The term, however, came to mean a simulated convertible. A landau bar is an ornamental feature located on a car's c-pillar derived from the roof form, primarily used on hearses.
Landau carriage sketch, showing the (real) bars folded and unfolded
1957 Imperial four-door hardtop "landau-type" roof design
Landau bar on the rear quarter panel of a Cadillac hearse
1951 Nash Rambler Landau
A hearse is a large vehicle, originally a horse carriage but later with the introduction of motor vehicles, a car, used to carry the body of a deceased person in a coffin at a funeral, wake, or memorial service. They range from deliberately anonymous vehicles to heavily decorated vehicles.
Cadillac hearse used at the state funeral of Ronald Reagan
Interior of a hearse in Denmark
Museo del Carmen de Maipú [es] Maipú, Chile
Jewish hearse, Theresienstadt concentration camp, Terezín, Czech Republic