Swell arrow

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A swell arrow is a graphic element in the form of an arrow that tapers or widens in length, which is often applied to rotary controls or sliders . The thickness of the swell arrow at a certain point symbolizes the current setting of the controller with regard to the minimum and maximum adjustable value. Swell arrows are often used for setting elements for which a scale with absolute values ​​would be irrelevant or meaningless for the user, such as volume controls or heating thermostats.