Symbol and Abbreviations
The SI unit symbol for the tonne is "t". Non-SI abbreviations for "tonne" ("metric ton" and "metric tonne") include "T", "mT", "MT", and "mt" (especially in the combination "mmt" or "MMT" for "million metric tons"), and "Te" (particularly in the offshore and nuclear industries). SI has no abbreviations for SI units, only symbols, and some of the abbreviations in use are actually SI symbols for other units: "T" is the SI symbol for the tesla and "Mt" is the SI symbol for megatonne.
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