Omicron (noun)

The 15th letter of the Greek alphabet, represented by "o" or "Ο" and used in mathematical, scientific, and technical notation.

Origin:

Late 18th century, from greek omicron, literally "small o".

Examples:

1. The mathematical equation used the Greek letter omicron to represent a specific constant.
2. In the Greek numeral system, omicron has a value of 70.
3. The scientist used the Greek letter omicron to label the variable in his experiment.
4. The letter omicron is used in the International Phonetic Alphabet to represent the open-mid back rounded vowel.
5. The Greek letter omicron is similar in appearance to the letter "o" in the Latin alphabet.