# A (disambiguation)

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A is the first letter of the Latin and English alphabet.

A may also refer to:

## Science and technology

### Mathematics and logic

• A numerical digit meaning ten in hexadecimal and other positional numeral systems with a radix of 11 or greater
• Sometimes in blackboard bold represents the algebraic numbers (${\displaystyle \mathbb {A} }$) (U+1D538 in Unicode)
• Universal quantifier in symbolic logic (symbol ∀ or ${\displaystyle \forall }$, an inverted letter A)
• Universal affirmative, one of the four types of categorical proposition in logic
• Mills' constant is represented by the symbol A
• Glaisher–Kinkelin constant is also often represented by the symbol A

## Arts and media

### Music

#### Performers

• A (band), a British alternative rock band

## Linguistics

### Letters

• A (or a), the first letter of the Latin alphabet
• A (Bengali), the romanized name of the Bengali letter অ
• A (cuneiform), the romanized name of a cuneiform sign
• A (Cyrillic) (A or а), the first letter of the Cyrillic alphabet
• A (kana) (or a), the romanized name of the Hiragana syllable letter あ and of the Katakana syllable letter ア used in Japanese, which may also be used to represent Asia
• Alpha (Α or α), the first letter of the Greek alphabet

## Transport

### Automobile

• Ford Model A, a name used by two separate cars produced by the Ford Motor Company:
• Geometry A, an electric mid-size sedan by Geely Auto

## Other uses

• A (grade), an academic grade
• A series of paper sizes defined by ISO 216, e.g. A4, A5 sizes
• A formation, an American football offensive formation
• A-Frame, a type of structure
• Ace, a playing card
• Agilent Technologies, with U.S. ticker symbol A
• Sentinel Peak (Arizona), more commonly known as "A" Mountain for the man-made rock formation in the shape of the letter
• Alfa, the military time zone code for UTC+01:00
• Farmall A, a tractor produced by International Harvester from 1939 to 1947