A radial gauge shows a single value on a circular dial, like a speedometer - an instantly familiar way to read a measure against its range.
When you want to show one value against a known range at a glance - a score, a utilization percentage, a speed - and a dial reads more naturally than a number alone.
The scale range and ticks, one or more pointers, and colored ranges that shade sections of the dial to mark good, warning, and critical zones.
Radial is a full or near-full circle, arc is a shallower curved segment that fits tighter layouts, and linear is a straight bar. They show the same kind of value; pick the shape that fits your space.
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MIT