R36

Here's a quick rundown of devices with a similar name as the R36S.

RK3326 SoC devices:

R33S (R35S/R36S in a Miyoo Mini+ shell)
R35S (clone of the POWKIDDY RGB20S, released 1-2 months before the R36S)
R36H (horizontal R36S/R35S)
R36MAX (sccer ball menu button, square buttons, 1:1 screen)
R36PRO (R36MAX with 4:3 screen)
R36S (probably the reason why you're here)
R36Plus (R36S with 1:1 screen)
R36S Plus (Really bad device. Terrible dpad, awful software, has the weak Allwinner F1C200S chip)
R36S Pro (probably does not even exist)
R36XX (newer R36S version with built-in wifi)
R40S Pro (R36S with a rounded bottom)
R50S (horizontal 5.1", not sure if it was ever released)
RX6H (horizontal version of the RX6S)
RX6S (vertical version of the RX6H)
RG36 (a vertical device with left joystick on top)
K36 (device from Kinhank, known for it's clones)
K36S (a mix of different devices)