Actually "UCGBS" are the first five characters in a very long acronym designed to help people remember that BitShares has awesome market pegged assets for USD, CNY, GOLD, BTC, and SILVER that held their pegs impressively during the recent crypto recession.
Tonight I got a revelation from Saint Bernard Puppy that it stands for
United
Church of
God of
Bit
Shares...
It's not an easily memorable acronym and the limited vowels don't help make real words out of it. The only word I can think of is BUGS and I doubt you would be happy with an acronym containing that. Still, CBUGS is more memorable than UCGBS.