Polygonal, with an opening in plan [PLFPO]

Same as PLFP but with an open internal courtyard or full height roofed atrium.

PLFPO_USA_WashingtonDC_Googleearth_1

The Pentagon in Washington, D.C., USA has pentagonal plan shape with an interior courtyard (Map data ©2013 Google, Commonwealth of Virginia, DigitalGlobe)