: Historically, a "barricado" was a sturdy, spiked wooden partition built across the deck of a slave ship.

: Sailors sometimes used rolled-up hammocks lashed together as a makeshift defense, which they would refer to as a "barricado" to protect against splinters and enemy fire. 2. Modern Safety & Construction Barricado or Barricade? - SNR

It stood about and was used to separate the crew from the captives, often featuring small holes for weaponry like blunderbusses or cannons to quell potential insurrections.