Glowing backs of jerseys - looks like a mountain profile?

Apologies if this has already been covered - but I could not find an answer.  Regularly while riding I see some glowing areas just above jersey pockets for some riders (sometimes me) - it looks like a climbing/mountain profile or similar.  Why does this appear, and what does it mean?  Are these ‘Ride On’ thumbs, by any chance?

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Are those the tips of fingers from the ‘Ride On’ - thumbs-up-hand - from other riders, sticking out the jersey pocket Andrew?

I think that may be right Paul - thanks for the reply.

It’s been bugging me for a while. wondering what they were.  I can ride without that distraction now.