Why, yes, you can (now). BBCode uses keywords inside square brackets to indicate things like changes in text style such as bold or italic or
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text. Originally the site would NOT interpret these codes, but lots of IGO members use these codes in our forums and in their "signature blocks", so it only makes sense to show them properly here. Enjoy!
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And, by the way, if you want to learn much more about BBCode you should check out http://en.wikipedia.org/wiki/BBCode.