From Team 449 Wiki
POE stands for Power Over Ethernet, which describes a system in which a single cable provides power to a device, and allows the device to share information.
"Power over Ethernet (POE) Explained." Veracity Global. N.p., n.d. Web. 29 Dec. 2016. <http://www.veracityglobal.com/resources/articles-and-white-papers/poe-explained-part-1.aspx>.