The tonne (SI unit symbol: t) is a metric system unit of mass equal to 1000 kilograms. It is a non-SI unit accepted for use with SI. To avoid confusion with the ton, it is also known as the metric tonne and metric ton in the United States and occasionally in the United Kingdom. In SI units and prefixes, the tonne is a megagram (Mg), a rarely-used symbol, easily confused with mg, for milligram.

In the U.S., the National Institute of Standards and Technology supports the symbol "t" for the tonne. The abbreviation "mt" or "MT" is also used in the U.S.

The SI unit symbol for the tonne is "t". 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).^{[citation needed]} 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.

Alex Metric (born Alex Drury) is a British musician, DJ and producer. He has released numerous EPs, remixed artists such as Depeche Mode, La Roux, NERD, Phoenix, and Bloc Party as well as working as a producer for acts such as The Infadels, Charli XCX and Adam Freeland.

Alex Metric started out as a nuskoolbreaks producer and came to prominence in 2008 after being voted 'Best Breakthrough Producer' at Breakspoll. He also got voted 'Best Remixer of the Year' by London radio station XFM. In 2009, Metric joined Radio 1's 'In New DJs We Trust' with his first show on June 12, 2009. Metric quit the station at the end of 2010 to concentrate on his productions. In January 2010 Clash Music magazine ranked him at number two in their list of the best DJs of 2010, second only to Brodinski. 2011 saw the release of his collaboration with Steve Angello "open Your Eyes" on Virgin / Positive which stayed on the BBC Radio 1 A list for 4 weeks. A compilation of Alex Metric's remix & production work also titled "Open Your Eyes" was released on August 22, 2011. During the past four years he has remixed high profile bands like La Roux, Gorillaz, U2, Depeche Mode, and the Beastie Boys.