Batt means several things depending on context. In construction, batt means pre-cut piece of insulation, typically fiberglass insulation in rolls or panels that fit between studs for thermal insulation, also called batt insulation. In textiles, batt means layer of fibrous material used as batting inside quilts or comforters for warmth. In military, batt is abbreviation for battalion, large military unit. In baseball or cricket, batt can be short for batting, as in batt average. Batt can also be verb meaning to beat or strike repeatedly, as in to batt something down. In British English, batt can be short for battery. So batt has multiple meanings, most common being insulation in construction, quilt batting in textiles, and battalion abbreviation in military. Spelling with double t distinguishes it from bat which is flying mammal and baseball equipment. So batt meaning is determined by context, whether construction, textiles, military, or sports.
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