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Hmmm...
I thought its some kind of Chinese letter since Nabi studios is located in Singapore.
So, its representing some word but they didn't wanted to make it that obvious so you need to connect those dots or something.
I was looking into it and tried to see how some words are written on Chinese language (although Malay and Tamil languages are also spoken there), words like bash, fight, martial arts etc... Then I tried the same for Tamil and Malay (they also use signs like letters). I found out some similarities, but nothing for sure.

In the end, I think it's plain letter T with the letter B under it. If you look closer, T letter is presented with 3 spots, one big in the center, and two on each sides, and it has a line going down (T), and letter B is presented with two spots, one smaller like a upper part of the B letter, and other bigger of the lower part of same letter.