Epsilon Tau Pi was created in 1999.
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They are both constants related to angular measure.
It is 1/tau or 1/(2*pi) of a whole turn.
1 radian = 360/tau (or 180/pi) of a whole turn.
n degrees = n*tau/360 or n*pi/180 radians.
1 radian = 1/tau or 1/(2*pi) of a whole turn.