Now that I think about it, I saw a Prius a year ago in a showroom that had two switches that looked like that. The dealer had added an aftermarket heat kit for the front seats.
So @jesgetme is on the right track - it looks like something aftermarket. Notice how the trim bezel is different than the traction control button.
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So @jesgetme is on the right track - it looks like something aftermarket. Notice how the trim bezel is different than the traction control button.