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From Odwiki

The Instance POP allows you to specify an object to be attached to each particle. You do it by speciying a full path to the object. The same thing can be done in the PointSOP. You may put expressions in the field to vary the name of the object being attached to the particle.

For example:

/obj/geo`$ID%5%`

will cycle over objects named /obj/geo1-/obj/geo5

/obj/geo`floor(rand($ID)*4.99)%`

will randomly pick from objects named /obj/geo1-/obj/geo5

This POP merely created string GeometryAttribute called instance which contains the full path to a GeometryObject . When you output to a renderer, objects in this string will be output and attached to the particles to the fly. Please read more about instancing in the MantraInstancing document.