D

How to type it

Left middle finger; hold Shift for the capital. Introduced in Lesson 2: Home row: d and k.

Common uses

• D is made by touching the tongue tip to the ridge behind the upper teeth, as in dog.
• A D is usually a low passing grade in American schools.

Less common uses

• D is the Roman numeral for 500.
• In hexadecimal, D stands for the value thirteen.
• Vitamin D is made in skin exposed to sunlight.