The griz photometric system was developed in the 1970s/1980s for use with electronic sensors, eventually CCDs. Other names are the Gunn photometric system, the Thuan-Gunn photometric system, and the Oke-Gunn photometric system, for some of its principal developers. The ugriz photometric system used by Sloan Digital Sky Survey is something of a follow-on but differs in detail. griz indicates the letter names of the passbands:
|passband indicator||centered on|
|i||763 nm||near infrared|
They are cited in various ways, such as Gunn-i.