A TeV is a unit of energy used in particle physics. 1 TeV is about the energy of motion of a flying mosquito. What makes the LHC so extraordinary is that it squeezes energy into a space about a million million times smaller than a mosquito.

http://lhc-machine-outreach.web.cern.ch/lhc-machine-outreach/lhc_glossary.htm

analogie marrante ^^