PlaceLocationMarker or PLM places some tiny debug geometry in the world at the specified coordinates. Above the box the name will be displayed as billboarded text that renders through walls so that you can find it. If no name is specified, the coordinates themselves will be used as the name. The default color is 0( white ), but specifying a number between 1 and 9 will use a different color.
PLM x y z name(optional) color#(optional )
PlaceLocationMarker 10, 25, 0 TestLocation