Traders of the Caribbean

[Stock Lobster]

On some of these, we have come to understand what they represent, by watching hundreds of L2s, and noticing their behavior.

You can also research them by looking up their ticker on one of the guides, like alphatrades market maker list:

http://www.alphatrade.com/E_Gate/tails/java/classes/resources/level2/marketMakerIDs/b.html

Then you can look up the company on the web. Odds are that if it is a small fund out of Boca Raton, it's probably involved in pipe financing. But there are many others as well.