Frags: The points you rack up, usually, but not always (as in this system), synonymous with kills.

Once you reach the 'threshold' of 4 frags in a row (4 frags without dying yourself), bonus's kick in.. At this point, every time you kill someone you get two frags (it also lets everyone know that you have that many frags in a row. Every kill after that get 2 frags per kill after that, until you die or reach 8 frags in a row. It doubles as your kill count (in a row) doubles. At 8 kills in a row, each kill counts for 4 frags! At 16 kills in a row, each frag counts for an incredibly 8 frags. You can see how simple this is and how fast your frags would accumulate if you could stay alive that long. For this reason, we recommend upping server fraglimits!

Here's a chart for those who like neat-o diagrams:
 
 

Of course, some of the same stuff would apply. For now, the only indicator is text messages at the top of the screen (and your frag count increasing really fast). However, we are planning on adding some HUD indicators, as well as possibly some in game effects to let people know that someone is Stayin' Alive!