This is the common term for donor intra uterine insemination i.e. if you are using donor sperm (sperm bought from a sperm bank or deposited from a known donor).
Further Reading:
What does the IUI procedure involve?
When should I have IUI?
Should I get up straight away after IUI?
Is IUI painful?
How & when is sperm collected for IUI?
What are the success rates for IUI?
Is it safe to do IUI at home?
What does washed sperm mean?
What is DIUI?
Related Articles:
Home Insemination
IVF
Natural Insemination