The+Theta

The Theta is a symbol in the Greek alphabet that was derived from a letter in the Phoenician alphabet, Teth. In Greece, it was used as a warning symbol for Death. The Theta is used in Trigonemetry and other maths including Algebra, where it is used as a plane angle, a special function for some complex variables and as a Greek numeral, it has the value of nine. The Theta basically means "the angle".

Fun Fact: In a show called Doctor Who, the name of the doctor character was Theta Si﻿gma. Theta