by 
The Curious Bag
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Theta has many meanings, some of which are derived from theta's appearance as the eighth letter of the Greek alphabet and its use as an abbreviation for the Greek word for death or as a warning symbol for death, according to www.greekorthodox.com. The symbol for theta resembles a skull.
Greek Alphabet
Theta was derived from the Phoenician letter teth. It is pronounced like th, as in think. The Greeks were the first to create an alphabet with vowels. It has 24 letters. In the Greek numbering system, theta has a value of nine.
Finances
Theta is the measure of the rate of decline in the value of an option due to the passage of time. It is also referred to time decay.
Designations
Theta, along with other Greek letters, are widely used in science and mathematics, especially for particle names in physics, star names in astronomy, fraternity and sorority names, and some tropical cyclone names, according to www.greekorthodox.com.
Math, Science
In geometry, lower case theta is a plane angle. Also, theta is used to describe brain waves recorded in the diagnostic test electroencephalogram (EEG) with a frequency of four to seven per second. Theta waves are mainly seen in children and emotionally stressed adults.
Religion
In Scientology, theta represents the spiritual being of man, combined with two other parts, mind and body. Other faiths use the term spirit or soul.
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