Thanks, jbgalvin, for your help. For some reason, all the Arial fonts that are installed on my machine do not include the slash zero character. And, for some other reason, my Adobe Acrobat Pro 7.0 stubbornly refuses to let me enter a special character. My goal here is to type in a sample number and have the Os (letters) clearly distinguishable from a 0 (zero). This is something field personnel are going to have to do on the fly, hence the need for simplicity. Any further ideas are welcome, otherwise they're going to just have to get out the old black pen.
Kathy