A series of curved lines rising and falling across the icon suggests the motion of ocean waves. Developers might use this symbol on a beach resort website's navigation bar to indicate a section about water activities or coastal scenery.
Part of the
Weather Set SVG collection,
in Nature.
Download the Waves vector as a ready-to-edit .svg file —
it scales to any size without losing quality and can be recoloured in any
vector editor or straight in CSS.