What does the lightning symbol mean?

If you see a lightning bolt like this Powermeter next to the listed Power for a segment, that means that the power value was recorded by a device called a power meter.

A power meter is a device, generally integrated into either a bicycle's crankset, bottom bracket, or rear wheel, that accurately and continuously calculates the wattage - or Power - being generated by the rider.

When a power meter is not present, Strava uses the best available information to calculate the Power value you see.  For more on that see How Does Strava Measure Power?

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