Tau n. : The common American toadfish; -- so called from a marking resembling the Greek letter tau (/).

Example:
Tau say For the greater good what would that economic system be like and the form of government?

Taxonomy
Tau, symbol, the Greek alphabet, shape, free encyclopedia, taf, the cross, death, Greek letters, curse, stauros, Sigma, search, free dictionary, phi, characters, uppercase, lowercase.

Defination from the web:
Tau in biochemistry is a protein associated with microtubules and is implicated in neurodegenerative diseases such as Alzheimer's Disease and FTLD. ... Hyundai Motors uses "Tau" to identify their recently introduced V8 engine. ...