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From Citizendium, the Citizens' Compendium

An accubitum (also sigma or stibadium) was a crescent-shaped couch used in the later Roman Republic, replacing the earlier triclinium for reclining upon at meals.

The mattresses and feather-beds were softer and higher, and the supports (fulcra) were lower in proportion, than in the triclinium. The clothes and pillows spread over them were called accubitalia (Historia Augusta, Antoninus Heliogabalus, 19, 25). Usually designed to accommodate five people, accubita continued to be used into the Middle Ages.

Sources

• Smith, W. (1878). A dictionary of Greek and Roman antiquities. London: J. Murray, a work that is now in the public domain.
• The Phrontistery
• "Triclinium" — 1911 Encyclopædia Britannica