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This paper retraces the 24 years starting with the appearance of the symbol"$\nu_{\tau}$" in 1977, until the observation of tau neutrino interactions withmatter in 2000. The fact that the neutral particle present in tau decays was aneutrino was demonstrated by 1979; its existence as the third neutrino$\nu_{\tau}$, iso-spin partner of the tau lepton, was definitely established in1981-1986; it was demonstrated that the number of light active neutrinos isclosed with the known ones ($\nu_e, \nu_{\mu},\nu_{\tau}$) in 1989; before 2000the $\nu_{\tau}$ properties had been precisely determined in $e^+e^-$ and$p\bar{p}$ collider experiments.

The third family of neutrinos