Triptaker

The Triptaker is presumably a medium, Constellation-sized, Banu ship.

In the short story A Gift for Baba (Part 3), Essosouli Draffa owned one such ship. The main chamber of the ship is described as having "intricate, detailed work of Banu craftsmanship glowing in the room’s warm lighting. Different materials and patterns combined in a patchwork along the curving, sweeping walls which met in a high pointed arch." In the story the ship has a crew of 2 Banu traders, & insufficient space for an assortment of cargo & salvageable components.