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 fluid level. The waves have also been described as mountains! They are used in a number of symbols and when seen usually means the coolant level is low. The symbol in the center looks more like the Greek Parthenon than a radiator, but there you are.
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