\ThetaThe Greek letter Theta (\Theta) is commonly used in mathematics and science to represent a variety of concepts. In mathematics, it is often used to denote an angle in geometry, a special function in trigonometry, or asymptotic notation in computer science to describe the limiting behavior of a function. In physics, it can represent temperature or other variables depending on the context.
Theta representing a right angle in geometry.
\Theta = 90^\circTheta notation representing the asymptotic behavior of a quadratic function.
f(n) = \Theta(n^2)Theta representing the angle whose cosine is -1.
\Theta = \arccos(-1)