A (disambiguation)

A is the first letter of the alphabet. It may also refer to:

• In English, it is one of the two indefinite articles, the other being an.
• In measurement, A is a symbol for area.
• In medicine, A is one of the human blood types.
• In music, A is a note.
• In physics, A is a symbol for ampere (which is also shortened to amp)
• In school, an A+ is the highest grade you can get, with an A being the grade below.
• In transport, A is the international license plate code for Austria.