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The tonne, symbol t, is a non-SI unit of mass accepted for use with the SI.
For everyday use, one cubic metre of water has a mass of one tonne.
The tonne is the unit of mass used on international standard road traffic signs.
The symbol T is the SI symbol for the tesla, and should not be used as a symbol for tonne.
The symbol for tonne, t, should always be on the line, e.g. 7.5 t, and not written as a superscript.