Greek alphabetic symbols are all available except omicron. <nowiki><math>\boldsymbol{\Omicron}</math></nowiki> and <nowiki><math>\boldsymbol{\omicron}</math></nowiki> both result in parser error. Strangely, replacing \omicron with ο (an actual omicron character) as in <nowiki><math>\boldsymbol{ο}</math></nowiki> seems to work. But this is an inconsistency since this technique will not work with other greek letters eg <nowiki><math>\boldsymbol{α}</math></nowiki>

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URL: http://meta.wikimedia.org/wiki/Help:Displaying_a_formula#Alphabets_and_typefaces