Stock Markets Exposed - In the Stock market quote, what does .OB mean?

In the Stock market quote, what does .OB mean?

like wwat.OB

It means securities are traded on the "over-the-counter bulletin board". http://www.investopedia.com/terms/o/otcbb.asp
It refers to the "over the counter market".. there are several types of "secondary" exchanges such as the "OTC" or pink sheet market and OTCBB market. The bigger markets are the NYSE, NASDAQ and AMEX
It means you should not invest in that company. I am a Portfolio Manager.
I agree its a very tough way to make a living as well as buying U.S. based pink sheets. They are also known as the bucket shop stocks. I rarely buy them. Even if you pick a "legit" company it will never get a fair valuation unless it has been hyped. I would say I had the most success with them when you buy them when they were previously not hyped and just before they upgrade to a better exchange since they are heavily discounted in comparison to a peer company on the better exchange. Otherwise, I think you stand at about the same odds if you were playing the Wheel of Fortune (the game with the worst odds) at a casino.