UB stands for UnitedBitcoin and also the recommended blockchain symbol of the asset / ticker for UnitedBitcoin. 
What is UnitedBitcoin's goal?
Rely on Bitcoin inacitve credit to provide more intelligent and stable blockchain services for bulk transactions
What is the difference between UnitedBitcoin and Bitcoin?
While UnitedBitcoin is inherited from Bitcoin, we've added many new security features and made additional functional improvements (faster transactions, SegWit support, smart contract functionality, payment channels via Lightning Network, etc.)
UnitedBitcoin currency system and bitcoin What is the difference?
UnitedBitcoin's total volume, distribution policy, block-time, halving time, and POW mechanisms are exactly the same as Bitcoin after the fork. The only difference with respect to the network is the increased block size to facilitate faster transaction validation.
http://www.ub.com/project/wallet
https://www.ub.com/news/detail?column=1&id=318
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