In heraldry, a compartment is a design placed under the shield, usually a landscape or wreath of some sort upon which the supporters are depicted as standing. It is a comparatively late feature of heraldry.
Usually when arms are augmented by supporters, a compartment will be added too.
... and the median income for a family is $71,784. Males have a median income of $50,361 versus $31,709 for females. The per capita income for the town is $24,031. 3.6% ...