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It means "Little Brown Mushroom". LBMs are incredibly difficult to identify accurately. There are hundreds of kinds and they often look amazingly alike. Some of them are deadly poisonous.
I can't see any details in those photos other than general shape and size type information. To have any chance at an ID we'll need lots more information. Spore print will be important. Check the sticky threads at the top of the forum - there's a bit in one of them to provide a format for a description.