Often, very low frequencies are called "slowly changing DC" or "baseline wander".

The frequency at which this equality holds for the particular circuit is called the resonant frequency.

Certain frequencies which are restricted to use by law enforcement are sometimes called "private carriers".

The lowest normal mode frequency is known as the fundamental frequency, while the higher frequencies are called overtones.

Other significant frequencies are called overtones of the fundamental frequency, which may include harmonics and partials.

The frequency represented by the number of narrow pulses per second is called the switching frequency or carrier frequency.

But a maintained, abnormal low frequency in a part of the brain can generate what is called an attractor.

The minimum frequency needed is called the cutoff frequency or threshold frequency.

This frequency is called the threshold frequency.

Cumulative frequency is also called frequency of non-exceedance.