at report time & date I observed a single solid black triangle, with no lights of any kind, traveling in a east to west direction at approximately a 60 degree angle. I saw this unknown object as I was faceing the south behind two homes while I was on patrol of a gated community in the heart of dallas. I had just hit a electonic key post when I happened to look up and noticed a solid black triangle apparently floating across my field of view. the object seemed totally silent and appeared to be approximatly about eleven or twelve hundred feet high. I watched disappear behind one of the homes and did not see it further. A call was placed to the DPD who ststed they had no other sort of report concerning strange aircraft. end report.((NUFORC Note: We spoke with this witness on two occasions, and we found him to be quite sincere and credible. PD))