O

How to type it

Right ring finger; hold Shift for the capital. Introduced in Lesson 10: Top row: w and o.

Common uses

• O is a vowel with several sounds, as in go, not, and to.
• O is the fourth most common letter in English text.

Less common uses

• O is the chemical symbol for oxygen.
• Blood types are labeled A, B, AB, and O.
• Many monospaced fonts add a slash or dot to zero so it is not mistaken for the letter O.