"Langue", Ferdinand de Saussure's linguistic term for "competency" or "I-language" (both Chomsky), referring to a cognitive "language" as distinct from surface forms—natural spoken language
Lang, variety of the jujube tree, whose fruits have a thicker skin compared to the fruits of other varieties
Lang Film, a film and TV production company in Freienstein, Switzerland
Lang Law, the informal name given to French law relating to book prices
Lang Propellers, British company specializing in aircraft propellers
Lang School, U.S. private school for gifted students, New York City
Lang Syne Plantation, U.S. plantation near St. Matthews, Calhoun County, South Carolina
Lang Van, a Vietnamese production company in Westminster, CA and Ho Chi Minh City