Blefish

https://statici.icloud.com/fmipmobile/deviceImages-9.0/iPhone/iPhone9,4-2-3-0/online-infobox__3x.png
                                                   A   B      C         D E F G

A: deviceImages version seems to determine the format of the image specifier (C, D, E, F)
B: device marketing name
C: device model identifier
D: front color (DeviceColor)
E: back color (DeviceEnclosureColor) (missing on very old devices)
F: color (device cover/backing/housing)?? (missing on older devices)
G: image variant