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A is the first vowel and letter in the Sanskrit alphabet. The phoneme “a” is thought to be the source of all other phonemes and its corresponding letter the origin of all other letters. As the basis of both the Sanskrit phonemic system and the written alphabet, the letter “a” Thus Comes to be invested with mystical significance as the source of truth, non-differentiation, and emptiness (shunyaTa), or even of the universe as a whole. The Prajna ParamitasarvatathaGATAMaTa-EKaKshARa, the shortest of the perfection of wisdom scriptures, also describes how the entirety of the perfection of wisdom is subsumed by this one letter. The letter in the Sanskrit SiddhaM alphabet gained special significance within the esoteric Buddhist traditions in Japan (MIKKYo), such as Shingon (see SHINGONSHu), which considered it to be the “seed” (BiJA) of MAHaVairochana, the central divinity of esoteric Buddhism, and used it in a distinctive type of meditation called AJIKAN (“contemplation of the letter 'a'”). The letter “a,” which is said to be originally uncreated (AJI HONPUSHo), is interpreted to be the essence of all phenomena in the universe and the Dharmakaya of the Buddha Maha Vairochana. In the East Asian Chan traditions, the letter “a” is also sometimes understood to represent the Buddha nature (FOXING, S. Buddhadhatu) of all sentient beings.

A on Wiktionary

Snippet from Wikipedia: A

A, or a, is the first letter and the first vowel letter of the Latin alphabet, used in the modern English alphabet, and others worldwide. Its name in English is a (pronounced AY), plural aes.

It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version can be written in two forms: the double-storey ⟨a⟩ and single-storey ⟨ɑ⟩. The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type.

In English, a is the indefinite article, with the alternative form an.

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

A may also refer to:

• a, a measure for the attraction between particles in the Van der Waals equation
• ''A'' value (A), a measure of substituent effects on the stereochemistry of cyclohexane
• Absorbance (A)
• Acceleration (a)
• Activity (chemistry) (a)
• Adsorption (a)
• Annum (a), for year
• are (a), a unit of area equal to 100 square metres (redirects to hectare)
• atto- (a), the SI prefix meaning 10⁻¹⁸
• Ampere (A), the SI base unit of electric current
• ångström (Å), a unit of length equal to 1

  metres

• Area (A)
• Attenuation coefficient (a)
• Bohr radius (a₀)
• Chemical affinity (A)
• Gain (electronics) (A) - Gain
• Hall coefficient (A_H)
• Hamaker constant (A)
• Helmholtz free energy (A)
• Hyperfine coupling constant (a or A)
• Magnetic vector potential (A)
• Mass number (A)
• Pre-exponential factor (A)
• The unique, or one of the, reciprocal lattice vector(s) (a*)
• Relative atomic mass (A_r)
• Richardson's constant (A)
• Rotational constant (A)
• Specific surface area (a)
• Thermal diffusivity (a)
• Unit cell length (a)