The distance between two repeating points of a wave is called the wavelength.

Here's a breakdown:

* Wavelength: The distance between two consecutive identical points on a wave, such as two crests (peaks) or two troughs (valleys).

* Crest: The highest point of a wave.

* Trough: The lowest point of a wave.

Wavelength is typically represented by the Greek letter lambda (λ). It is an important characteristic of a wave, as it determines the wave's frequency and energy.