Non italic (upright) greek letters

From https://groups.google.com/d/msg/mathjax-users/VZB-ub85ioc/T_eenOOfDWsJ

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How to get upshape greek letter?

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The upper-case Greek letters can be obtained using \rm, eg, {\rm A B \Gamma}. The MathJax web fonts only include lower-case Greek letters in italic form, so there are no upright versions available. You can use something like \unicode[Times]{x3B1} to obtain the alpha symbol from the Times font (assuming the user has that installed), which will be an upright version.