According to the United States Patent and Trademark Office, "A service mark
is any word, name, symbol, device, or any combination, used, or intended to
be used, in commerce, to identify and distinguish the services of one
provider from services provided by others, and to indicate the source of the
services. "
See
http://www.uspto.gov/web/offices/tac/tmfaq.htm#DefineServiceMark
According to the following site
http://www.sei.cmu.edu/about/legal-trademarks.html
it's just a superscripted SM.
You can easily create an autotext/autocorrect entry for it if you need to.
An autocorrect that replaced sm followed by a space may be OK as there are
not too many words (though there are a few) that end is sm. Maybe replace
smm would be better as it would not deprive you from having an orgasm (in
your text of course) if you wanted one.
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Hope this helps,
Doug Robbins - Word MVP