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What subatomic particle, discovered in the 1970s by Martin Lewis Perl, is the "third" lepton, after the electron and the muon?

What subatomic particle, discovered in the 1970s by Martin Lewis Perl, is the "third" lepton, after the electron and the muon? Correct Answer the tau

The tau is the subatomic particle discovered in the mid-1970s by a group led by Martin Lewis Perl at the Stanford Linear Accelerator Center. Perl named the new particle, the third charged lepton (after the electron and the muon), for the Greek letter that begins the word third.

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