Huh, weird, I have no idea. I didn't even notice that. I wonder if mine have that symbol. They're supposed to be non-marking soles, so maybe that's it?
ETA: mine don't have that symbol, just checked - they're Vibram brand.
ETA again: According to google -
Quote:
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the yellow triangle on the keen sandal means "Keen Protect". It is the rubber that protects your toes
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