Wiktionary
n. A soup made from shark fins, common especially in Chinese culture, where it is served on special occasions and as a symbol of wealth and prestige.
Wikipedia
Shark fin soup (or shark's fin soup) is a traditional soup or stewed item of Chinese cuisine and Vietnamese cuisine served at special occasions such as weddings and banquets, or as a luxury item in Chinese culture. The shark fins provide texture, while the taste comes from the other soup ingredients. The soup originated centuries ago during the Ming Dynasty. Demand for the soup has increased as income levels of Chinese communities worldwide have risen. International concerns over the sustainability and welfare of sharks have impacted consumption and availability of the soup.