delta rhythm, delta wave(noun)
the normal brainwave in the encephalogram of a person in deep dreamless sleep; occurs with high voltage and low frequency (1 to 4 hertz)
A delta wave is a high amplitude brain wave with a frequency of oscillation between 0–4 hertz. Delta waves, like other brain waves, are recorded with an electroencephalogram and are usually associated with the deepest stages of sleep, also known as slow-wave sleep, and aid in characterizing the depth of sleep.
The numerical value of delta wave in Chaldean Numerology is: 8
The numerical value of delta wave in Pythagorean Numerology is: 3
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