Ny

Nyloc Nut
A nut with an elastic ring that grips the bolt and stops he tendancy for the nut to vibrate loose.
Nylon
A synthetic polymer used in the manufacture of fibres.
Nylon Hammer
A soft face hammer with a nylon face.
Nyquist Frequency
Half the sampling frequency. Any analog frequency component above the Nyquist frequency will, after sampling, be converted (aliased) to a frequency below the Nyquist frequency.
Nyquist Plot
A plot of real versus imaginary spectral components that is often used in servo analysis. Should not be confused with a polar plot of amplitude and phase.