Physical unit (SI) for the magnetic flux density, symbol [T]. 1 T is 1 Vs/m² = 1 N/Am. 1 Vs also is designated 1 Wb ("Weber"), therefore 1 T = 1Wb/m².

The unit [Tesla] is designated according to the serbian scientist and inventor Nicola Tesla, who did important research contributing wireless radio and energy transmission end of the 19th, beginning of the 20st centutry.