Any upright post or beam used as a support, as for the deck, the quarter rails, awnings, etc
A stanchion is a pole or bar that stands upright and is used as a support. a strong upright bar used to support something (estanchon, from estance; STANCE)
Wood (usually mahogany or teak) deck support that transfers the compression forces from the mast to the hull Also serves as the mounting platform for the centerboard winch and wooden spinnaker halyard cleats
A pillar of wood or iron used for various purposes in a ship: to support the deck, the quarter rails, the nettings, the awnings etc