I have an "MM" badge too, but like you, I have no idea where it came from.  It can't be MindModeling because I have not worked that project.

Mine only shows up on my badge list on Free DC. I wonder if there isn't a glitch some where with Free DC?

MM are Combined from Free DC and only show on Free DC so they are your Milestones for Combined BOINC projects so to say.
You will also see other badges that are shown as the 4 for Collatz Conjecture and the 2 for Asteroids@Home

bcavnaugh
MM are Combined from Free DC and only show on Free DC so they are your Milestones for Combined BOINC projects so to say.
You will also see other badges that are shown as the 4 for Collatz Conjecture and the 2 for Asteroids@Home

Yup, it's for Mega Milestones 
 

Whooo Woooo! 

Afterburner
Whooo Woooo! 

Yeah, that MW star is a true beauty
Gratz

Got this one today:
The Threonine from GPUGRID for reaching 50mil
 

 

 Orange_1050   Nice One +1. It is the next Badge that will take for ever, at least that is what it seems.

Nice work Orange!

bcavnaugh
 Orange_1050   Nice One +1. It is the next Badge that will take for ever, at least that is what it seems.

Yeah, it's always the a next one, ha ha, but hey, isn't it the way it rolls?
Also, I followed Your advise bcavnaugh, "Register".
Got a msg from Collatz today, "You are the user of the day"
Not seen it in my badges yet, but I'll wait for it. Your badge is very cool bro^^
The  badge thing........
Oohh... I see addiction coming
 
THX AB, means alot to me