What does batt stand for in insulation?

Batt in insulation does not stand for acronym, but comes from word batting, which refers to layers of fibrous material used for stuffing or insulation, similar to quilt batting. Batt insulation is named because it is manufactured as flat blanket-like pieces or batts that resemble batting used in quilts, made of fiberglass, mineral wool, or cotton. So batt is short for batting, not an abbreviation where each letter stands for something. Some people think BATT stands for something like blanket type thermal insulation, but that is folk etymology, not official. In construction, batt insulation is simply insulation in pre-cut blanket form that fits between studs, as opposed to blown insulation which is loose fill or spray foam. Batts are available faced with paper or foil or unfaced. So batt stands for batting, describing form of insulation as blanket-like pieces, not acronym, and term describes physical form of insulation product rather than technical abbreviation.