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If you see a hammer and scredriver above your browser setup lets you see emojis. If you see a square it does not. Chrome often doesn't, firefox almost always does... point is, don't use them on web pages and then go submit to adsense inclusion, or anything where a human is about to check out your site.
They look bad when they look square. Google raters and adsense approvers likely use chrome so if nothing else... check in chrome.