Answer is: Tungsten (symbol W).
Melting point of rhenium (symbol Re) is 3180°C.
Melting point of rhenium (wolfram) is 3420°C.
Tungsten or wolfram is a chemical element with atomic number 74. It has the highest melting point of all the elements discovered.
The Celsius scale was based on 0°C for the freezing point of water and 100°C for the boiling point of water at 1 atm pressure.