\Tau
The Greek letter Tau (\Tau) is used in various scientific and mathematical contexts. It often represents torque in physics, the golden ratio conjugate in mathematics, or shear stress in engineering.
Tau as the golden ratio conjugate.
\Tau = \frac{1 + \sqrt{5}}{2}
Tau representing torque, where r is the position vector and F is the force vector.
\Tau = r \times F
Tau representing shear stress, where F is the force applied and A is the area.
\Tau = \frac{F}{A}