Aegis
AEGIS (Goat Skin) In Greek mythology, the shield of ZEUS made by the smith-god HEPHAESTUS and covered with the skin of the goat-nymph AMALTHEA. The shield had the power to terrify and disperse the enemy. When Zeus shook it, the shield produced tremendous thunder and lightning storms. It also had the power to protect friends. The aegis was also worn by ATHENE, when it bore the head of the GORGON, MEDUSA, in its center. The aegis is a symbol of divine protection.
Taken from : Greek and Roman Mythology A to Z, Revised Edition – Written by Kathleen N. Daly and Revised by Marian Rengel – Copyright © 2004, 1992 by Kathleen N. Daly