[metapost] uright greek "mu" symbol in Metapost

[L. Nobre G.]

Try something like

beginfig(1);
  transform T;
  numeric referenceangle, tangentd, shiftlen;
  picture micromu;
  referenceangle = 14;
  shiftlen = 3mm;
  tangentd = sind(referenceangle)/cosd(referenceangle);
  T = identity slanted (-tangentd);
  micromu = thelabel( btex $\mu$ etex, origin );
  draw micromu transformed T;
  draw micromu shifted (-shiftlen,0);
endfig;

L. Nobre G.