Any guesses? I know what I think it looks like.
huh? it’s a forearm panel.
I had to really pay attention for a while as well. Took me the longest time to figure out just what the hell that was.
Look at it from the other direction 
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Oh…didn’t get what you meant as first, because it looks way too short and thin to me.
ha!
i have two of those…one on each side.
ahhh… that’s what that is. I couldn’t quite figure it out… I even clicked the ad and went to the QR page to find out… but there was no additional info or pictures there.