I've been thinking about that for a while. I came to a conclusion that "md" is md_5's initials. But it could be something else
.
Here's what I came up with:
md = ....
Then What's the 5 for?
What does md_5 stand for?

Here's what I came up with:
md = ....
- Michael Doll
- Miguel Diming
- Mister Dumplings
- Martin Drumstick
- Michelle Douglass XD
- Miroko Dimii
- Margo DatFatMoose
- Medical Doctor
Then What's the 5 for?
- 5 medical doctors
What does md_5 stand for?