Steam Input's Gyro Space / 3DOF to 2D Conversion Style,

3DOF to 2D Conversion Style, also known as Gyro Space, is an option on converting from the Motion Sensor/Gyro's three degrees of freedom over to 2D output (i.e. which axes get used to output to mouse or joystick). As part of the New Gyro overhaul: Gyro Turning Axis has repurposed into a Gravity Vector-based Axis system that includes Local Space, Player Space and World Space.

If you happened to play games on Consoles (like in Fortnite, Splatoon, The Legend of Zelda: Breath of the Wild/Tears of the Kingdom, Deathloop and No Man's Sky): you most likely experienced it.

If you like to know more about Gyro Space: I'll highly recommend Jibb Smart's Player Space Gyro explanation