What is the meaning of 蔀?

latticed shutters hung vertically between pillar bays of traditional Japanese buildings, that might be folded up or removed

a latticed screen set up to protect against waves and spray on boats to small to have a proper rail

a door used to shield parts of a castle from viewing from the outside

a panelled door of two or three sheets of wood, slid into the pillars of the entrance to a city house at night

a surname

Source: wiktionary.org