Android ROMs

Name	Version	≈Devices
ArrowOS	T	100
CalyxOS	U	26
CarbonROM	R	50
crDroid	U	100
DerpFest	T	90
GrapheneOS	U	21
Havoc-OS	T	20
LineageOS	U	200
LineageOS for microG	U	200
OmniROM	U	6
Paranoid Android	U	60
Pixel Experience	T	110
PixelOS	U	60
Resurrection Remix	Q	80
Syberia OS	U	30

The letters, what do they mean?
9P, 10Q, 11R, 12S, 13T, 14U.

Bonus, Google Apps