Nyquist rate

A property of a signal: the minimum sampling rate, $2B$ , the theorem requires for its bandwidth $B$ .

The Nyquist rate of a signal band-limited to $B$ Hz is $2B$ -- the minimum sampling rate the Nyquist-Shannon theorem requires (strictly exceeded, never merely met) for exact reconstruction. It is a property of the signal itself, computed from its own bandwidth, not of any particular sampling rate chosen to record it. Not to be confused with the Nyquist frequency, a property of a chosen rate instead.

Examples

A signal band-limited to $B=60$ Hz has Nyquist rate $2(60)=120$ Hz, regardless of what rate it's actually sampled at.