Arrowhead colors
Arrowheads can be white (or empty), hatched, or black.
▪When the arrowhead is white, the line is not attached at either end.
▪When the arrowhead is hatched, the line is attached at one end.
▪When the arrowhead color is black, the line is attached at both ends to another symbol.
The junction point of a line and the symbol to which it is attached looks like a cross when the line is selected.