A பொருளணி type: describing something indirectly, by naming or describing something else closely associated with it instead of naming it outright.

A poet who never names the king, only describes the army that always marches behind him, is still unmistakably writing about the king - பிறிதுமொழிதல் அணி lets a poem point without pointing.

Describing a king by describing the mighty army that follows him, rather than naming the king directly.