TAU — Definition of TAU
noun
1
The letter Τ/τ in the Greek, Hebrew and ancient Semitic alphabets, being the nineteenth letter of the Classical and Modern Greek, the twenty-first letter of Old and Ancient Greek.
2
A Τ-shaped sign or structure; a Saint Anthony's cross, sometimes regarded as a sacred symbol.
1658: Nor shall we take in the mysticall Tau, or the Crosse of our blessed Saviour, which having in some descriptions an Empedon or crossing foot-stay, made not one single transversion. — Sir Thomas Browne, The Garden of Cyrus (Folio Society 2007, p. 168)
3
A tau meson, now usually known as a kaon.
4
An unstable heavy lepton, which decays into a muon or electron; a tauon.
📚 Source: en.wiktionary.org/wiki/tau
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