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Cal
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== Science and math == * ''[[Calanthe]]'', an orchid genus abbreviated cal. in horticulture * [[Calcium hydroxide]], also called cal * [[Caliber]], firearm barrel measurement * abbreviation for [[calorie]], a unit of energy * (archeological) abbreviation of '[[calendar]]' (before 1950), or 'calibrated' (after 1950), for a year as identified by radiocarbon dating (i.e. calBCE 3000, cal. 3600 BC) * [[Cold Atom Laboratory]], an instrument to research Bose-Einstein Condensates on the International Space Station
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