[texhax] Trade mark symbol

[John Simmie]

Hi:  I can't find the LaTeX command to generate a trade mark symbol, 
capital R in a circle ...
\copyright is no problem and I could make a superscript TM but is there 
\trademark or \registered around
Thanks, John

                 Dr. John M. Simmie
Chemistry Department & Environmental Change Institute
    National University of Ireland, Galway::Ireland
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