First "O" Facts
"O" is thought to be the oldest letter in the alphabet at about 3,150 years old. Ancient Syrians called the letter "O" ayin, which translates to the word "eye" "O" is about the fourth most commonly used letter in English printed material. As an abbreviation, it can mean Oxygen, ocean, old, or ohm. "O" is expressed in Morse code by dash-dash-dash.
The 24th and final letter of the Greek alphabet is omega, which corresponds to the English letter "O" and is often used to mean "the last" of a series.