The Æsculapian Order (also referred to as A/O) is one of eight Psi Orders in the Trinity era. As with the other psi orders, the A/O was founded in 2103 by one of the eight proxies — specifically, Proxy Dr. Matthiew Zweidler, MD. Members of the Order are often referred to as Æsculapians. Since this is a mouthful, they're more commonly called vitakinetics (after their Aptitude), docs (because they're generally doctors of some sort), or rexs (because of the medical community's standard Rx symbol).