NTT may refer to:*Nippon Telegraph and Telephone, a telephone company that dominates the telecommunication market in Japan Its group companies can be found at Name That Tune, a now defunct game show New Technology Telescope, a 3.6m telescope located at La Silla Observatory, Chile Giant Robot (Giant Robot album), an album by the band Giant Robot and recording company NTT Records Number theoretic transform, a mathematical transform similar to the Discrete Fourier transform… (More on Ntt)