The UK "Kettle" type power cable features an IEC C13 jack on one end and a UK 3-pin plug on the other. It's designed for use with IEC C14 devices, such as the Raspberry Pi PoE+ Splitter and Pi-DigiAMP+ Power Brick.
IEC is used for powering a variety of electrical appliances including PC's, printers, monitors as well as a whole range of other equipment!