It's possible you're thinking of:
* Arc/Arch (Greek: Ἀρκούς, Arkous): This refers to the constellation Ursa Major (the Great Bear), which is associated with the myth of Callisto and her transformation into a bear.
* Ares (Greek: Ἄρης, Ares): The god of war, often depicted with a helmet, shield, and spear.
* Artemis (Greek: Ἄρτεμις, Artemis): The goddess of the hunt, wilderness, childbirth, and the moon.
Please clarify the name or provide more context, and I'll be happy to help you further.