You can key in the ascii code directly by holding the Alt key down and pressing 0146

You can also use the Insert Symbol function at Insert > Symbol > More Symbols > Special Characters and pick it from the list. That interface shows me a keyboard shortcut that doesn't work for me but you might have more luck with it. You can also assign a keyboard shortcut or autocorrect in this dialog.

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Andrew Lockton
Chrysalis Design, Melbourne Australia