This is fun: Google uses this code instead of an image with a down-arrow:
<small>▼</small>
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on Sunday, August 3rd, 2008 at 3:04 pm and is filed under General.
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August 4th, 2008 at 3:07 am
Yep, there’s also one that points right, but I wasn’t able to find the entity for the down and left arrows.