In anatomical terms, an afferent is a vessel or other conduit that brings substances towards a central area, which is often a major organ like the brain or the heart. It is the opposite of an efferent vessel, which carries substances away from these central locations.
The system of imperial units or the imperial system (also known as British Imperial) is the system of units first defined in the British Weights and Measures Act of 1824, which was later refined and reduced.
The Imperial Guard, also known as the Emperor's Guard and the Dark Honor Guard, was a force of elite warriors who served the Sith Emperor of the resurgent Sith Empire as his personal protectors and enforcers. Founded sometime before 3959 BBY, the Guard was composed entirely of non-Force-sensitive individuals mentally bonded to the Emperor.