Wave and Sound

A harmonic (諧波) of such a wave is a wave with a frequency that is a positive integer multiple of the frequency of the original wave, known as the fundamental frequency (基頻):

• harmonic(諧波)
A harmonic is any member of the harmonic series. A harmonic of such a wave is a wave with a frequency that is a positive integer multiple of the frequency of the original wave, known as the fundamental frequency.
• fundamental frequency(基頻)
the 1st harmonic (第一諧波)
• overtone(泛音)
any frequency greater than the fundamental frequency of a sound.

Frequency(f = 440 Hz)	Order	Name	Wave Representation	Molecular Representation
f x 1 = 440 Hz)	1	fundamental tone(基頻), the 1st harmonic(第1諧波)
f x 2 = 880 Hz)	2	the 1st overtone(第1汎音), the 2nd harmonic(第2諧波)
f x 3 = 1320 Hz)	3	the 2nd overtone(第2汎音), the 3rd harmonic(第3諧波)

References

https://en.wikipedia.org/wiki/Harmonic