What is meant by a single ended or complimentary output?

What is meant by a single ended or complimentary output?

A single ended output is a signal that is always referenced to the shield (which is typically earth ground) on the output connector. This is the most common type of signal output or input.

A complimentary output has both the channel and the channel(NOT), or an inverted (180 degrees out) version of the channel. If you drive a differential input with both CH and /CH, then you will develop twice the voltage into that device.