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A is the first letter of the Latin alphabet. A may also refer to: == Science == * A battery, a vacuum tube filament battery * Vitamin A, also called retinol, an essential human nutrient * Haplogroup A (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup * Haplogroup A (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup * A+ and A-, human blood types * Adenine, nucleic acid * Alanine, amino acid * Adenosine, nucleoside * ATC code A, Alimentary tract and metabolism, a section of the Anatomical Therapeutic Chemical Classification System * Anode, an electrode * The center of a hexagonal face of the Brillouin zone of a hexagonal lattice, in physics * The letter "A" was formerly the chemical symbol for the element argon, which is now indicated by the symbol Ar. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「A (disambiguation)」の詳細全文を読む スポンサード リンク
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