What do the different map room icons mean?

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Sometimes a party member scouts the dungeon, or I find a piece of map, and the mini-map on the screen reveals icons on the room that I imagine is supposed to indicate to me what's in the room. However, I don't see a legend for these anywhere. For instance, in the screenshot below, you can see 4 different icons, but I've seen at least 3 more that aren't represented there.
What are all the different room icons and what do they mean?
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What all Icons Mean on Map | A LOTRO Guide.
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Images: Ksenia Chernaya, Ksenia Chernaya, Ksenia Chernaya, RF._.studio