ambit, range, scope, reach, compass, orbit - an area in which something acts or operates or has power or control: "the range of a supersonic jet"; "the ambit of municipal legislation"; "within the compass of this article"; "within the scope of an investigation"; "outside the reach of the law"; "in the political orbit of a world power"

board - a flat piece of material designed for a special purpose; "he nailed boards across the windows"

armor plate, armor plating, armour plate, plate armor, plate armour - specially hardened steel plate used to protect fortifications or vehicles from enemy fire

body armor, body armour, cataphract, coat of mail, suit of armor, suit of armour - armor that protects the wearer's whole body