"Tb" is an abbreviation for "to be." It is commonly used in texting or online conversations to indicate that something is about to happen or will happen in the future. Full definition
The console will come with up to 2 TB of hard drive space so you can upload games to your hearts desire. (averagexboxgamer.com)
On top of that, you'll get a 1 TB hard drive, so you'll have plenty of room to store all your media and files. (businessinsider.com)
Vitamin D — and other nutritional factors — are known to influence the severity of TB in humans but its relationship with cattle and other mammals has not been studied until now. (sciencedaily.com)