Sorry, this is die deterioration doubling. Not considered an error and has no premium. http://www.error-ref.com/die-deterioration-doubling/
Although some of them are definitely DDD, some of them appear to be hit marks. But again, no error, no premium.
It is unrealistic to expect a new member can differentiate between DDD and DDO acronyms. Since the OP ignored my comment, but liked and responded to yours, I’m going to assume the OP thinks you meant DDO and thinks she has something special. Please try to word your feedback according to your audience.
I know what die determination doubling means! Just because I'm new to the hobby doesn't mean I'm not well read on the topic!
Now TELLING the difference between DDD and DDO, now THAT is the tricky thing. Trickier than I anticipated.
It’s nothing personal, it’s just an observation about expectations for new members. DDD will likely mean nothing to most new members, especially those who cannot already tell the difference.