The same fellow who presented us with “This is what Pi Sounds Like”, musician Michael Blake interprets the mathematical constant Tau to 126 decimal places. So you know the rules.
For those geeks among us, here is Wikipedia’s definition of Tau:
Tau (uppercase Τ, lowercase τ; Greek: Ταυ [ˈtaf]) is the 19th letter of the Greek alphabet. In the system of Greek numerals it has a value of 300. The name in English is pronounced /ˈtaʊ/, but in Modern Greek it is [ˈtaf]. This is because the pronunciation of the combination of Greek letters αυ has changed from ancient to modern times from one of [au] to either [av] or [af], depending on what follows (see Greek orthography). Letters that arose from tau include Roman T and Cyrillic Te (Т, τ). The symbolism of the cross was connected not only to the letter chi, but also to tau, the equivalent of the last letter in the Phoenician and Old Hebrew alphabets, and which was originally cruciform in shape. The letter occupies the Unicode slots U+03C4 (lowercase) and U+03A4 (uppercase). In HTML, they can be produced with named entities (τ and Τ), decimal references (τ and Τ), or hexadecimal references (τ and Τ).
For the gamers Tau is:
In the universe of Games Workshop's table-top wargame Warhammer 40,000, the Tau Empire is an alien race, inhabiting a small but dense region of space on the eastern edge of the Galaxy, roughly 300 light years in diameter. The Tau were first introduced to Warhammer 40,000 in late 2001, the result of Games Workshop's plan to introduce a new race to the game.
The Tau have advanced rapidly since their first encounter with the Imperium of Man in the 35th millennium, rising from a savanna dwelling hunter-gatherer level of technology to a starfaring race in less than six thousand years. Tau society has also advanced rapidly, from warring tribes to a unified caste system working towards common goals, known by the Tau as Tau'va, The Greater Good.
As well as the five castes of the Tau, multiple alien species are incorporated into the Tau Empire; the most significant of these being the Kroot and Vespid although many other races, including the space faring Nicassar and the mercenary Tarellian Dog Soldiers are members. In addition, human auxiliaries (Gue'vesa in the Tau language) are sometimes seen to be aiding the Tau as well.
The Tau were the fourth army to receive a Codex updated for Fourth Edition rules (Codex: Tau Empire - Hoare, 2006). Additional rules for the Tau appear in a Forge World Imperial Armour rules supplement (Imperial Armour Volume Three - The Taros Campaign - Kinrade, 2005).
Now aren’t you glad you asked?