A triangle is, by definition, the lowest number of points at which an object composed of lights can appear to have a shape. That is a simple effect of perspective, and particularly at night the actual object bearing the lights may not in fact even be triangular at all. I mention this because 'triangle UFO' almost seems to come across as if it were some production model of UFO....whether that is intended or not. It seems to me, rightly or wrongly, that that IS the intended interpretation. In my view not enough attention is given to debunking this terminology.