Tau

In a study reported in the journal Science Translational Medicine, researchers describe how a synthetic drug, called antisense oligonucleotide, reduced the production and in some cases cleared clumps of tau in the brain.

Source: tatoeba (12257400)

Astronomers have detected swirls of diamonds, hundreds of thousands of times smaller than a grain of sand, in the protoplanetary or circumstellar disks of three baby star systems in the Milky Way - V892 Tau, HD 97048, and MWC 297.

Source: tatoeba (12356806)

Hence it appears that the spits, or skewers, on which and to which the lamb was fixed and fastened in order to be roasted, assumed the form of a cross, not such a tau-cross as is engraved in Dr. Oliver’s Historical Landmarks of Freemasonry, vol. i. p. 80. having three arms only like the Greek letter tau; but a cross like the ancient Hebrew tau, with four arms, though not necessarily all of equal length.

Source: wiktionary

In the Spanish translation of Sallust, by the Infant Don Gabriel in 1772, called the Infant Sallust, there is a curious dissertation by Father Perez Bayer on the resemblance between the ancient Hebrew and Phœnician alphabets, in which it is observed that the Hebrew Tau was written in pure Phœnician, […]

Source: wiktionary