These are the Low Coolant warning lights. Their meaning is straightforward, in that the engine’s cooling system is low on fluid, with or without the arrow. Have the system serviced soon.
The shape of the symbols is meant to resemble a radiator and the wavy lines at the bottom indicates a fluid level. This is used in a number of symbols and when seen usually means the level is low. The symbol to the right looks more like the Greek Parthenon than a radiator, but there you are.
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