Mechanical parts are sometimes given the designation "M".
You can get a PDF of standard Reference Designators at:
http://www.pcbstandards.com/siteindex.html
Scroll down to "Standards" and you'll find it there.
-Denis

At 09:25 AM 2/21/2002 -0600, you wrote:
>To All
>
>I have a  question about what is used as a reference designator for a
>mechanical part that is added to the PCB during the assembly process and
>is not a post soldering process. This part is a mechanical part that is
>soldered to the PCB as a keying feature. Similar to a 7343 part. What do
>you use to denote this part?
>Any input would be appreciated.
>
>Thanks
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>Thank you.
>Tellabs
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