The term "aegis" primarily means shield or protection, originating from ancient Greek mythology where it referred to a protective cloak or shield associated with Zeus and Athena. In modern usage, it denotes being under the protection, support, or sponsorship of a powerful or authoritative entity, often an organization or government. For example, a project under the aegis of a university is conducted with its support and protection. Additionally, "Aegis" is the name of an advanced American naval combat system integrating radar and missile technology designed to detect, track, and destroy enemy targets, notably used by the U.S. Navy and allied forces. This system metaphorically embodies the protective nature of the original aegis shield from mythology. Thus, "aegis" can refer to either:

• The symbolic notion of protection or patronage by a powerful entity,
• The specific ancient Greek mythological shield, or
• A modern naval weapons system named after this concept of strong protection.

Each context shares the theme of defense and safeguarding under a strong protector.