The Indigo is an SGI graphics workstation. It's outstanding graphics performance, fast CPU and nice design made much of the company's legendary reputation. The Indigo was available with R3000 processors; the later Indigo R4000 aka IP20 also came with a R4000 processor. The Indigo can also utilize a R4400 processor from older Indigo2 (IP22) machines clocked at 150MHz.
Siemens-Nixdorf was shipping an OEM version of the Indigo as the RW 320.