A work written by Khema, a thera, probably of Ceylon.
The work is on the Abhidhamma and forms one of the Let-than ("Little-finger" manuals) studied in Burma.
It is also known as the Námarúpasamása.
A Commentary on it was written by Vácissara (Gv.61, 71; SadS.63; for details see P.L.C.156).