I guess that might help...if some brokerages are listing it that way.
The major US Territory I've seen listed in recent years is PR (PuertoRico) by my brokerage, for any of their funds....an occasional small amount for Guam....and maybe a teeny amount for Virgin Islands.
If your brokerage just lists a Total for all three, you could probably just use PR, and make a note to yourself.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*