Who or what is Tesla?

Tesla is an SI unit for measuring the strength of a magnetic field and is abbreviated in physics with the symbol (T). This unit is named after the famous inventor Nikola Tesla, who discovered alternating current among hundreds of other phenomena. A magnetic field of one Tesla, for example, is about 30,000 times as effective as the Earth's magnetic field, whereas magnetic resonance imaging typically achieves a field strength of 2 Tesla. Exotic cosmic objects such as a magnetar, which is a neutron star with a massive magnetic field, produce between 0.1 and 100 gigatesla.