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Heading (or yaw) (in Heading, pitch and roll angles) is the rotation around VERTICAL axis. Which is Y-positive (or 0,1,0) in default OpenGL.

It determines whether camera is looking north, east, south or west (or any in-between). Usually its -179.999999 degress to 180 degrees (since -180 deg is exactly the same as 180 deg - i.e. looking exactly back via rotation either to the left or to the right).

When pitch is -90 or 90 degress, the heading and roll is pretty much the same thing - it doesn't matter whether human looking exactly up is rotating only his head around the center of his eyes (roll) or he is rotating with all his body around vertical axis (heading).