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Model A1502 / 2.4, 2.6, or 2.8 GHz dual-core Intel processor / Released October 2013

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weird sign on my MacBook Pro motherboard

I recently bought a late 2013 MacBook Pro on ebay and when I was looking I found this weird sign on the motherboard, but the laptop works perfectly.

Block Image

Block Image

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What happens when you wipe it with a cleaner? Does it come off?

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I contacted the previous owner he said that was water damaged.thank you

really appreciate.

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Vittorio Kosseta crwdns2934231:0crwdne2934231:0
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