This is the Fog Lamp Indicator symbol. The indicator is active only when the fog lamps are activated. The wavy line crossing straight ones is meant to indicate light passing through the fog.
And, yes, there is a Rear Fog Lamp Indicator symbol, in amber. This indicator also is only active when the lamps are actually on. The lines point to the right in this symbol, indicating a rear-facing beam. Very few vehicles are equipped with these rear-facing fog lamps.
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