What are the Icons on chests

What is the icon on chests that are located below the level of the chest? It isn’t on all chests…
ie I have one with a flame and another with two rain drops?

Dungeon symbols denoting that the chest is a dungeon chest drop and has higher chances of dropping that dungeons associated gear and spells. You can see these drops by looking at each dungeons loot drop table (chest icon on dungeon select screen)

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