Plural of aegis, meaning protective sponsorships, shields, or authoritative protections under which something operates.
From Greek aigis (goatskin), originally referring to Zeus's protective cloak. The term evolved in English to mean any form of protection or sponsorship, particularly institutional or divine backing.
The aegis was literally the armor of Zeus—a magical goatskin cloak with a fearsome head of Medusa on it. When we say something operates 'under the aegis' of an organization, we're still borrowing the power of that ancient divine protection.
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