What does « ultimate gain Ku » in Ziegler–Nichols method mean?

This is a good and simple explanation on ultimate gain Ku which is required for the Z-N PID tuning method.

http://electronics.stackexchange.com/questions/286858/pid-what-does-ultimate-gain-ku-in-ziegler-nichols-method-mean

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PID-controller and Ziegler-Nichols Method: How to get oscillation period?

This is a set of good illustration and instructions on how to attain the Ku (ultimate gain) which is important for using Zielger-Nichols tuning method.

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