Unique Physiology is a catch all, or umbrella, term used broadly to describe subjective powers similar to the topic name. For instance, Magic is used to describe any kind of mystical ability. Catch all terms can also be used to denote other powers such as Energy Projection used for any blast powers.
Sometimes confused with "alien physiology", Unique Physiology is a term used to describe the nature of some characters to have certain advantages over normal human beings. It is a reflection of a character's biological heritage, even Earth-based races such as Atlanteans and Amazons also benefit from having a unique physiology.