The emblem and armour of Athena is the aegis; whenever she raises up the aigis her enemies are overtaken by panic and soon are lost. The aigis, as its name tells, is a goat-skin
Burkert establishes the aegis as Athena’s definitive cultic and martial attribute, linking its panic-inducing function to its origin as a monstrous goat-skin and connecting it to actual goat sacrifice in Athenian cult.
, Greek Religion: Archaic and Classical, 1977thesis