rep question

[Sasuke eats nards]

i just logged back on and had two rep notifications. one was green, and i know that means plus rep, and the other was gray. i'm not sure what the gray is. so my question is, what is the gray rep bar mean?

 

[~Dream~]

Gray means neutral, someone that has under 50 posts gave you either a ***** or -rep.

 

[Joon]

Neutral, given by member that don't have enough reputation power.