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It's basically like a profile picture here. Though it can also apply to other pictures stored in your profile gallery, but not used as the main forum display
How do I embed an avatar picture in my posts?
You just need to copy the image address and paste it into your post.
Does anybody know how to post a long string of random characters without the formatting screwing it up?
Why do you want to do that?
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How well does it match the trope?