If you are looking for synonyms for Athena's shield, then there are a few options you could choose from. Firstly, you could use the Greek word "Aegis," which is often used to refer to the shield of Athena. Alternatively, you could use "protective shield," "defense mechanism," or "barrier of safety." Other options include "armored protection," "fortification," or "protection barrier." Each of these words conveys the idea of protection and safety, which is the primary function of Athena's shield. So if you want to describe a shield that offers protection and security, any of these synonyms could work well.