Conditional residence visa: 

A visa granted on certain conditions.  Foe example, a person has been married for less than two years when their husband or wife (spouse) gets lawful permanent resident status (gets a green card), the spouse gets residence on a conditional basis.  After two years you and your spouse must apply together to the DHS to remove the condition to the residence.

The investor visa (EB5 or T5/C5) is also a conditional residence.  It requires an application procedure after two years to remove the condition on the permanent residence.