So Raspberry Pi have a new model out (the Raspberry Pi Zero W). Having taken a look at the photos, I see that on the reverse, where the CE and FCC compliance marks are shown, there is another symbol. It's hard to describe - something like a "T" with a parallel bar over the top enclosed by a three-quarter circle and a horizontal lightning bolt above the "T" but inside the partial circle.
Here's a picture:
and a close-up:
Does anyone know what this symbol represents? My guess would be another compliance mark.