Aegis is a roman term meaning " the protection, backing, or support of a particular person or organization." and "(in classical art and mythology) an attribute of Zeus and Athena (or their Roman counterparts Jupiter and Minerva) usually represented as a goatskin shield."

The "A" is the roman character for "A". It is placed on a roman styled shield, and a roman font is used. A strong connection to the origin of the term. These all represent strength and integrity.

My favorite hidden element of the logo is that in the full Aegis logo, because the shield is open on the right side for Aegis to be spelled out, it subtly forms a C. Aegis is Aaron Cowie's company, so there is an "A" on top of a "C", his initials.