A tachyon is any hypothetical particle that can travel faster than the speed of light. E. C. G. Sudarshan, V.K Deshpande and Baidyanath Misra were the first to propose the existence of particles faster than light and named them "meta-particles". After that the possibility of particles moving faster than light was also proposed by Robert Ehrlich and Arnold Sommerfeld, independently of each other. Lately, Similar concept was coined with the term "tachyon" by in 1967.