Brown goods refers to merchandise in the consumer electronic audiovisual field, such as televisions, radios, stereo sets, etc. The name came from the brown (furniture color) cases in which such merchandise was historically manufactured.
At one time, brown goods also included all furniture. 
Brown goods is also used in a different connotation within other categories.
For example, in the alcoholic beverage industry, brown goods is often used as a collective designation for spirits such as bourbon, scotch whiskey and cognac. 
- American Marketing Association, AMA Dictionary.
- Common Language in Marketing Project, 2021.