IKONOS is a commercial earth observation satellite, and was the first to collect publicly available high-resolution imagery at 1- and 4-meter resolution. It offers multispectral (MS) and panchromatic (PAN) imagery. The IKONOS launch was called by John E. Pike “one of the most significant developments in the history of the space age”. IKONOS imagery began being sold on January 1, 2000.
It derived its name from the Greek term eikōn for image.
Read more about Ikonos: History