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[hr]{TEXT}[/hr]
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<hr title="{TEXT}">
Or without any text at all, since I can't imagine really wanting that...
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[hr][/hr]
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<hr>
(A brief glance at the phpBB forums suggest that it doesn't support self-closing tags, so "<hr/>" may not work. But I'm not sure which versions of phpBB that may or may not have been true for.)