Theta Symbol
The Greek letter theta (θ) is often used as a variable in mathematics to represent an angle. Theta appears in the three main trigonometric functions: cosine, sine, and tangent as an input argument.
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Unicode  θ 

Usage
Given the angle of a right triangle as input, returns the ratio of the triangle's opposite side over its hypotenuse.
Given the angle of a right triangle as input, returns the ratio of the triangle's adjacent side over its hypotenuse.
Given the angle of a right triangle as input returns the ratio of the triangle's opposite side over its adjacent side.
An angle is defined as the amount of rotation between two rays. Angles are measured using degrees and radians. A full rotation in degrees is 360°. A full rotation in radians is approximately 6.283 radians or τ (tau) radians.