The combination is a classic phono-semantic compound: the water radical (氵) gives the meaning (ocean), and the sheep character (羊) gives the sound (yáng).
The term 洋 is deeply tied to China's history, particularly its interactions with the West since the 19th century. When Western traders, missionaries, and soldiers began arriving by sea, the term 洋 became a shorthand for their origin. Initially, “洋” things were often seen as novel or superior. For example, kerosene was called `洋油` (yángyóu, “foreign oil”) and matches were `洋火` (yánghuǒ, “foreign fire”). This reflected the technological gap at the time. However, this period was also marked by conflict, such as the Opium Wars, leading to terms like `洋人` (yángrén, “ocean person” or foreigner) and the derogatory `洋鬼子` (yáng guǐzi, “foreign devil”). These terms carry the weight of colonialism and a “century of humiliation.” In the West, we might use “imported” or “exotic” to describe foreign goods, which is a neutral, economic term. 洋 is different because it is rooted in a specific historical encounter—the arrival of the West by sea. It carries a sense of “otherness” that is both cultural and historical. While a term like `外国人` (wàiguórén) is a neutral descriptor, 洋 often implies a specific *type* of foreign: Western, modern, and from a culture fundamentally different from China's.
In modern Mandarin, 洋 is used in several distinct ways. Its connotation can range from neutral to positive to slightly dated.