Abbreviation for International Wine Challenge (wine competition) and International Wine Cellar (internet platform of Stephen Tanzer); see there. Found on https://glossary.wein.plus/iwc
The International Whaling Commission; the international organization founded in 1946 to manage and conserve populations of the great whales for the benefit of future generations. Found on https://www.marinemammalobservertraining.com/help/glossary/