Théta

Théta is a Greek letter that represents the eighth letter of the Greek alphabet. It is a lowercase letter and is written as θ. In the Greek numeral system, théta has a value of 9. In mathematics, théta is commonly used to denote the angle in polar coordinates and is also used as a variable in various mathematical expressions. In physics, théta is often used to represent the angle of inclination or the angle between two vectors. In computer science, théta is used in the Big Theta notation to describe the asymptotic behavior of an algorithm. The letter théta is also used in linguistics to represent the voiceless dental fricative sound, similar to the English "th" sound in "think."