[PrivateIdaho]

Does anybody know what the yellow "mg" initials signify on the flight patch?

[Physicist]

Does anybody know what the yellow "mg" initials signify on the flight patch?

Microgravity. It's actually not an "m" but a Greek letter mu, which is used as an abbreviation for "micro" (an "m" means "milli").

[Mark Felton]

"Does anybody know what the yellow "mg" initials signify on the flight patch?"

the letters are the greek letter "mu" and "g". It stands for micro-gravity, which was the nature of most of their experiments in the payload.