Button combination
#LG

Time peek
#LG

Active Edge
#Google

Motion Sense
#Google

Idle lock screen
#Google

Menu button in navbar
#Google

Heart Rate Monitor
#Samsung

Secondary BW e-ink display
#yotaphone

Secondary color display that blends with back
#Nubia

Moto mods
#motorola

OnePlus 8 Pro infrared camera
#OnePlus

Pressure Sensitive Home Button
#Samsung

Android NFC beam
#Google

Show carrier name in Status bar
#xiaomi

Dot cover
#htc

LG G5 modules
#LG

and manual rotate camera (honor 7i)
#huawei

Hardware keyboard buttons
#Sony

galaxy s4 zoom's physical camera + shutter button
#Samsung

secondary display panel
#LG

Xperia Play buttons
#sony