An elevator split into 2 halves which can be operated independently so that the same control surfaces can be used to control the roll of an aircraft as well as the pitch. Often seen on Flying Wings and Delta planform models.
Elevon is a term that means both aileron and elevator combined into the same control surface. It is used on tailless aircraft such as as flying wings. Like ailerons, an elevon provides for a plane's roll control by moving in opposite directions and like an elevator, provides pitch control by moving up and down together. In order for a plane to have elevons either a computer r/c system is needed or a mixer (either electronic or mechanical).
An elevon is an aircraft control surface that combines the functionality of the elevator (used for pitch control) and the aileron (used for roll control), hence its name. It is frequently used in tailless aircraft such as flying wings.