<human>:  With regards to nuclear magnetic resonance, or NMR, where does the name come from?
<bot>: The name comes from the fact that the technique uses nuclear magnetic resonance. Nuclear magnetic resonance is a phenomenon that occurs when a nucleus, such as an atom of hydrogen, absorbs a radio wave. The nucleus then emits a radio wave at a different frequency. This is called the nuclear magnetic resonance (NMR) signal.