Talk:Tau

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I learned that in modern Greek tau is called taf. So I guess the letters here are pronounced in ancient Greek?

It is written ταυ, which is pronounced roughly "taf", because υ takes on a sound varying between "f" and "v" when it follows an α or ε. --Delirium 03:39, Mar 4, 2005 (UTC)

Can anybody tell the significance of tau usage in engineering industry at present.