Poop. A poop is a superstructure which extends from the after perpendicular forward to a point which is aft of the forward perpendicular.
The poop may originate from a point aft of the aft perpendicular. <Chapter I, regulation 3>.
Source: IMO Resolution MSC.143(77), amendments to Annex B to the 1988 Load Lines Protocol, 5 June 2003, International Maritime Organization. Legislation