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Ha may refer to: ==Science and measurement== * Hahnium, an element now called Dubnium * Hartree, an atomic unit of energy * Hectare (ha), a unit of area * Hectoampere, a unit of electric current * Hour angle, in astronomy, one of the coordinates of the equatorial coordinate system * Hyaluronan (Hyaluronic acid), a carbohydrate structure * Hydroxylapatite, a mineral * High availability, systems design and implementation with a view to maximising service 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「Ha」の詳細全文を読む スポンサード リンク
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