The part of the wave that the arrow is pointing to is the crest.
Wave is defined as a disturbance that travels through a medium and transfers energy from one point to another without causing any permanent displacement of the medium itself.
The given diagram is a waveform. The waveform consists of a crest and a trough.
The trough is the minimum amplitude of the waveform while the crest is the maximum amplitude of the waveform
From the graph, the red dots are the crest of the graph while the blue dots are the trough.
Hence we can conclude that the part of the wave that the arrow is pointing to is the crest.
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