Alternatively, you can click on it to select it. The procedure from this point on is slightly different in Word 7 and Word 97. Word opens the AutoText dialog box with the slashed zero already entered in the Selection box. Enter an appropriate abbreviation in the Name box and choose Add to create the AutoText entry, then close the dialog box. But the abbreviation doesn't matter, because you won't be using it anyway, as you'll see in moment.
Word expands the abbreviation to a slashed zero.
But there is still one problem. If you type the abbreviation within a larger number, so that some character other than a space is to its left, Word won't recognize it. If you type 10 and then F3, for example, you'll get an error message. Go to the Categories list and highlight AutoText, then go to the AutoText list and highlight the abbreviation for the slashed zero. You should now be able to enter the slashed zero by typing Alt-0, even in the middle of a word or number.