tray landscape stone; bonsai landscape stone
A stone used as the foundation or central element in a tray landscape (盆石), a traditional Japanese art similar to bonsai or miniature rock gardens. The term is domain-specific and not commonly encountered outside of traditional arts contexts.
Small gravel is laid on the tray landscape stone to represent mountains and water.
Compound of 盆 (tray) and 石 (stone), literally 'tray stone'. The term is directly descriptive of its use in traditional tray landscape art.