Which term is used for the highest point of a wave?

The term used for the highest point of a wave is "crest." In wave terminology, the crest is defined as the maximum displacement of the wave from its equilibrium position, representing the top point in the wave's periodic cycle. Understanding the crest is essential when discussing wave properties such as amplitude, which measures the height from the equilibrium position to the crest or trough, and frequency, which relates to how often the wave oscillates.

Other terms, such as trough, specifically refer to the lowest point of the wave, while amplitude refers to the maximum distance of the wave from its rest position. The term peak can be synonymous with crest in casual language, but in physics, "crest" is the more precise term used to denote the highest points of a transverse wave.