For many commands a default option is available when the Enter key is pressed. If there is no default option or value, pressing the Enter key exits from the command. The format for the default is as follows:
<default>
The text within the angle brackets should provide some hint as to the use of that option, such as <width>, not <RETURN>. The default option should not be “eXit” except in command line prompts that are nested.
If a default value is passed to the current option when the ENTER key is pressed, then that value should be enclosed in angle brackets: <??>. There should be only one set of angle brackets per prompt.
Example:
Command: cone
Specify center point of cone or [Elliptical] <0,0,0>: