You can embellish any line or curve by adding a starting and/or ending arrowhead to it (Figure 7.15). And if you don't like the predefined arrowhead styles, you can design your own.
Select a line with the Pick Tool.
Choose line start and end styles from the drop-down lists on the property bar (Figure 7.16).
or Select the Outline Pen dialog box from the Outline flyout or press ...
Figure 7.16. Choose arrowhead start and end styles from the drop-down lists on the property bar or in the Outline Pen dialog box.